Patent Description:
A problem which occurs with fluid filter assemblies, particularly useful for diesel engines and gasoline marine engines, is facilitating the removal of contaminants from the filter assembly. These contaminants include water and particulate matter which tend to settle at the bottom of housings used to retain filter elements. In order to remove the water and particulate matter suspended in the water, drain valves are frequently positioned at the bottom of housings used to retain filter elements. If a simple drain cock is utilized for the valve, the drainage may not be complete or may not occur at all because a partial vacuum is created in the filter housing upon initiating drainage. The partial vacuum prevents water from flowing through the open valve.

Fuel supply systems, and in particular vehicle fuel systems generally comprise at least one fuel filter to remove water and other contaminants from the fuel. For medium and heavy duty trucks, there is generally a need for multiple fuel filters, for instance a pre-filter for separating out water on the suction side (that is, upstream of the main fuel pump) and for removing large particulate contaminants and a final filter for removing fine particles on the pressure side (that is, downstream of the main fuel pump). It is generally necessary to continuously or periodically remove the separated water from the fuel filter in order to prevent water passing through the filter element into the fuel system and therefore reaching the engine injector nozzles. The filter media also needs to be changed at the regular intervals as it becomes clogged by contaminants leading to high pressure drop across the primary filter.

Manual water drain systems are frequently positioned in a position within the engine bay which is not easily accessed. Additionally, manual draining of water is inconvenient for the operator and if neglected can cause water to pass through the fuel filter media and enter the fuel system causing damage to the engine injector nozzles thereby reducing life of the engine.

As an alternative to manual water drain systems, solenoid activated water drain valves have been developed. Solenoid fuel drain valves are electrically operated. Operation may be controlled manually, for instance by activation of a switch within the vehicle cabin by the operator of the vehicle in response to a warning signal that water is present in the fuel filter. A problem associated with some conventional types of solenoid fuel drain valves is that the primary filter needs to be pressurised in order to expel water through the valve. This requires the provision of an additional electrical pump, which increases the cost of the filter.

However, as the improved solenoid fuel drain valve still needs to be operated by the vehicle operator there remains a chance that the operator may forget, or fail to dispose of the water correctly, risking damage to the remainder of the fuel system and the engine, in particular the injector nozzles. Additionally, the solenoid drain valve releases some fuel along with the water, which unless collected and disposed of correctly is a source of pollution.

It is an object of embodiments of the present invention to obviate one or more of the problems associated with the prior art, whether identified herein or elsewhere. In particular, it is an object of embodiments of the present invention to provide a water drain system which is suitable for operating on the suction side of a fuel supply and which eliminates the requirement for the involvement of a vehicle's operator.

The patent publication <CIT>, titled "Improvements in and relating to solenoid fuel drain valves" and assigned to Parker Hannifin Manufacturing UK Ltd discloses a solenoid fuel drain valve comprising a valve body, having a drain hole and an air inlet opening , a solenoid coil and a piston, the drain hole having a drain inlet and a drain outlet, and the piston being arranged within the valve body to be moveable between a closed condition, wherein the drain hole and the air inlet opening are sealed, and an open condition, wherein the drain hole and the air inlet opening are open, movement of the piston being controlled by the solenoid. In one of the embodiments of the said valve, one or more air inlet openings are sequentially opened as the piston moves from the closes to the open condition and vice versa. The present invention improves upon this by implementing a design which opens the pathways for the drain water and the air simultaneously thus preventing the choking of the pathway for the drainage of water due to the creation of vacuum.

The principal object of the present invention is to provide an auto drain valve <NUM> for fuel system and more particularly the present invention comprises a valve body <NUM> wherein a piston <NUM> having a piston rod <NUM> with sealing disk <NUM> and sealing member <NUM> which is movable within said valve body <NUM> wherein air vent <NUM> and liquid outlet <NUM> closes simultaneously.

One of the objects of the present invention is to provide an auto drain valve <NUM> comprising a valve body <NUM> is connected to the bowl <NUM>; valve body <NUM> consisting of air vent <NUM>, liquid inlet <NUM>' and liquid outlet <NUM>; piston <NUM> having a piston rod <NUM> with sealing disk <NUM> and sealing member <NUM> arranged within the valve body <NUM>; Anchor <NUM> and fixed guide <NUM> is mounted into cavity of valve body <NUM> and piston rod <NUM> is supported by means of fixed guide <NUM> and Anchor <NUM>; solenoid coil <NUM> surrounds the piston rod <NUM>; spring <NUM> and spring <NUM> resiliently biasing on the Piston <NUM> to seal air vent <NUM> into sealing engagement with the sealing member <NUM> and liquid outlet <NUM> with the sealing disk <NUM> by means of compression force when the solenoid coil <NUM> is in its de-energized condition; when the solenoid coil <NUM> is energized and Piston <NUM> moves away from air vent <NUM> and liquid outlet <NUM> simultaneously, so that the valve is open, and air will enter into the bowl <NUM> through valve body <NUM> through air path <NUM> and liquid is drained form bowl <NUM> through liquid inlet <NUM>' into valve body <NUM> and drained out form liquid outlet <NUM>.

One of the objects of the present invention is to provide an auto drain valve <NUM> which comprises a piston <NUM> comprising a piston rod <NUM> with sealing disk <NUM> and sealing member <NUM> wherein spring <NUM> and spring <NUM> resiliently biasing on the sealing disk <NUM> and sealing member <NUM>.

One of the objects of the present invention is to provide an auto drain valve <NUM> comprises a solenoid coil <NUM> in de-energized condition both air vent <NUM> and liquid inlet <NUM>' are remain closed and during solenoid coil <NUM> energized condition piston rod <NUM> with sealing disk <NUM> and air vent <NUM> moves upward direction wherein air vent <NUM> and liquid outlet <NUM> open simultaneously. Further the magnetisable material is attached to the piston rod <NUM> are suitably arranged within the valve body <NUM> such that energisation of the solenoid coil <NUM> causes a magnetic field to be induced in the solenoid coil <NUM> and in the piston rod <NUM>. In this embodiment, the piston rod <NUM> is then attracted to the solenoid coil <NUM>, and movement of the piston rod <NUM> is affected.

One of the objects of the present invention is to provide an auto drain valve <NUM> wherein, solenoid coil <NUM> during de-energized condition both air vent <NUM> and liquid outlet <NUM> are remain closed and solenoid coil <NUM> during energized condition sealing disk <NUM> moves upward direction by means of piston <NUM> wherein air vent <NUM> and liquid outlet <NUM> open simultaneously.

One of the objects of the present invention is to provide an auto drain valve <NUM> consisting of valve body <NUM> which comprises air vent <NUM> and liquid outlet <NUM>.

One of the objects of the present invention is to provide an auto drain valve <NUM> consisting of valve body <NUM> which comprises air vent <NUM> which allows air to enter into body of auto drain valve <NUM> and liquid is drained form bowl <NUM> through liquid inlet <NUM>' into valve body <NUM> and drained out form liquid outlet <NUM>.

One of the objects of the present invention is to provide an auto drain valve <NUM> wherein, valve body <NUM> comprises drain passage as air water path <NUM> connecting the air liquid inlet <NUM>' to liquid outlet <NUM> drains water direct from bowl <NUM> attached to fuel tank and does not comprises any separate chamber.

One of the objects of the present invention is to provide an auto drain valve <NUM> wherein, auto drain valve <NUM> comprises threading mechanism on bowl <NUM> to disengage drain valve <NUM> from fuel system.

One of the objects of the present invention is to provide an auto drain valve wherein spring <NUM> and spring <NUM> resiliently biasing on the sealing disk <NUM> and sealing member <NUM> provides compression force to the sealing disk <NUM> and sealing members <NUM> and said spring <NUM> and spring <NUM> can be coli spring, helical spring, spiral spring, leaf spring.

One of the objects of the present invention is to provide an auto drain valve <NUM> consisting of wherein a water level indication sensor allows to energise drain valve system by reaching water at predefined level and water sensor is located into the bowl wherein said sensor measures the level of water and drain said water automatically.

One of the objects of the present invention is to provide an auto drain valve wherein manual drain mechanism is also available in any emergency conditions.

One of the objects of the present invention is to provide an auto drain valve, which is easy to disassemble for maintains.

The objects, features and advantages of the invention will best be understood from the following description of various embodiments thereof, selected for purposes of illustration, and shown in the accompanying figures.

An auto drain valve <NUM> in accordance with the principles of the present invention as indicated in <FIG>. The Auto drain valve <NUM> comprises valve body <NUM> having at least one air vent <NUM>, at least one liquid inlet <NUM>' and at least one liquid outlet <NUM>.

The principal embodiment of the present invention is to provide an auto drain valve <NUM> for fuel system and more particularly the present invention comprises a valve body <NUM> wherein a piston <NUM> having a piston rod <NUM> with sealing disk <NUM> and sealing member <NUM> which is movable within said valve body <NUM> wherein air vent <NUM> and liquid outlet <NUM> and closes simultaneously.

One of the embodiments of the present invention is to provide an present invention is to provide an auto drain valve <NUM> comprising a valve body <NUM> is connected to the bowl <NUM>; valve body <NUM> consisting of air vent <NUM>, liquid inlet <NUM>' and liquid outlet <NUM>; piston <NUM> having a piston rod <NUM> with sealing disk <NUM> and sealing member <NUM> arranged within the valve body <NUM>; Anchor <NUM> and fixed guide <NUM> is mounted into cavity of valve body <NUM> and piston rod <NUM> is supported by means of fixed guide <NUM> and Anchor <NUM>; solenoid coil <NUM> surrounds the piston rod <NUM>; spring <NUM> and spring <NUM> resiliently biasing on the Piston <NUM> to seal air vent <NUM> into sealing engagement with the sealing member <NUM> and liquid outlet <NUM> with the sealing disk <NUM> by means of compression force when the solenoid coil <NUM> is in its de-energized condition; when the solenoid coil <NUM> is energized and Piston <NUM> moves away from air vent <NUM> and liquid outlet <NUM> simultaneously, so that the valve is open, and air will enter into the bowl <NUM> through valve body <NUM> through air path <NUM> and liquid is drained form bowl <NUM> through liquid inlet <NUM>' into valve body <NUM> and drained out form liquid outlet <NUM>.

One of the embodiments of the present invention is to provide an auto drain valve <NUM> comprises a piston <NUM> comprises piston rod <NUM> with sealing disk <NUM> and sealing member <NUM> wherein spring <NUM> and spring <NUM> resiliently biasing on the sealing disk <NUM> and sealing member <NUM>.

One of the embodiments of the present invention is to provide an auto drain valve <NUM> comprises a solenoid coil <NUM> in de-energized condition both air vent <NUM> and liquid inlet <NUM>' are remain closed and during solenoid coil <NUM> energized condition piston rod <NUM> with sealing disk <NUM> and air vent <NUM> moves upward direction wherein air vent <NUM> and liquid outlet <NUM> open simultaneously. Further the magnetisable material is attached to the piston rod <NUM> are suitably arranged within the valve body <NUM> such that energisation of the solenoid coil <NUM> causes a magnetic field to be induced in the solenoid coil <NUM> and in the piston rod <NUM>. In this embodiment, the piston rod <NUM> is then attracted to the solenoid coil <NUM>, and movement of the piston rod <NUM> is affected.

One of the embodiments of the present invention is to provide an auto drain valve <NUM> which is consisting of sealing member for air path <NUM> and water path <NUM>. Sealing members are made from any material and any shape. Sealing member for air vent and sealing member for water vent may differ in size, shape and material as per requirement.

One of the embodiments of the present invention is to provide an auto drain valve <NUM> wherein sealing member provides hermetic seal to water path as well as air path <NUM>.

One of the embodiments of the present invention is to provide an auto drain valve <NUM> wherein, sealing disk <NUM> and sealing member <NUM> for sealing air path <NUM> and water path <NUM>. Sealing members can be moulded with sealing disk, detachably-attached with sealing disk or rigidly attached with sealing disk. Most preferably is detachably attached sealing member because if any damage to sealing member it can be easily changed or replaced.

One of the embodiments of the present invention is to provide an auto drain valve <NUM> wherein, solenoid coil <NUM> during de-energized condition both air vent <NUM> and liquid outlet <NUM> are remain closed and solenoid coil <NUM> during energized condition sealing disk <NUM> moves upward direction by means of piston <NUM> wherein air vent <NUM> and liquid outlet <NUM> open simultaneously.

One of the embodiments of the present invention is to provide an auto drain valve wherein spring <NUM> and spring <NUM> resiliently biasing on the sealing disk <NUM> and sealing member <NUM> provides compression force to the sealing disk <NUM> and sealing members <NUM> and said spring <NUM> and spring <NUM> can be coil spring, helical spring, spiral spring, leaf spring. The Auto drain valve <NUM> connected at the bottom part of bowl <NUM> and filter screen <NUM> is connected at top part of the bowl <NUM> from where water is to be drained to the valve body opening <NUM> provided in the said filter screen <NUM>.

In one of the preferred embodiment Piston <NUM> consisting of piston rod <NUM> with sealing disk <NUM> and one or more sealing member <NUM> to seal air vent <NUM> is mounted onto said sealing disk <NUM> and sealing to seal liquid outlet <NUM>. Further, piston rod <NUM> with sealing disk <NUM> and one or more sealing member <NUM> is movable within Anchor <NUM>, which is mounted into valve body <NUM>. In this preferred embodiment, the spring <NUM> and spring <NUM> is a coil spring, but the spring <NUM> and spring <NUM> could be any other element for applying a resilient force to the Piston <NUM>, biasing it toward the stop to close mainly liquid outlet <NUM> and air vent <NUM>. The spring <NUM> is main spring mounted on sealing disk <NUM> to seal liquid outlet <NUM> and spring <NUM> is mounted on sealing member <NUM> to seal air vent <NUM>. The valve body <NUM> comprises liquid inlet <NUM>' and liquid outlet <NUM> which can be controlled by means of piston <NUM> by means of solenoid coil wherein solenoid coil <NUM> controls the movement of upward or downward of the piston <NUM> (<FIG>).

Further the piston <NUM> comprises upper part of the piston <NUM>' and lower part of the piston <NUM>" wherein upper part of the piston <NUM>' comprises piston rod <NUM> with sealing disk <NUM> and one or more sealing member <NUM> to seal air vent <NUM>; Further, lower part <NUM>" comprises piston rod <NUM> is with sealing disk <NUM> and sealing member <NUM> to seal liquid outlet <NUM> and air vent <NUM>, further an opening <NUM> is provided in the piston rod <NUM>, which in the energized condition of solenoid coil <NUM> allows flow of water into the recess <NUM> of the said piston rod <NUM> in order to facilitate draining of water through liquid outlet <NUM>. The piston <NUM> can be move within Anchor <NUM>, which is mounted into valve body <NUM>. The spring <NUM> is located onto sealing member <NUM> to seal air vent <NUM> by means of compression force. The spring <NUM> main spring is mounted onto sealing disk <NUM> to seal liquid outlet <NUM> and air vent <NUM> by means of compression force (<FIG>the position of sealing member <NUM> which seals the air vent properly).

<FIG> of the present invention illustrate the cross-sectional view of the auto drain solenoid valve <NUM> for draining liquid from fuel system wherein valve body <NUM> is connected at the bottom part of bowl <NUM> and filter screen <NUM> is connected at top part of the bowl <NUM> from where water is to be drain through valve body <NUM>. Further, Anchor <NUM> is mounted into cavity of valve body <NUM> and piston rod <NUM> of the piston <NUM> is supported by means of fixed guide <NUM>. Further, the solenoid coil <NUM> controls the movement of upward or downward of the piston <NUM> wherein fixed guide <NUM> is allow to move piston rod <NUM> in upward and downward direction. Piston <NUM> consisting of piston rod <NUM> with sealing disk <NUM> to seal liquid outlet <NUM> and sealing member <NUM> to seal air vent <NUM>. The piston <NUM> can be movable within Anchor <NUM>, which is mounted into valve body <NUM>. The spring <NUM> is located onto sealing member <NUM> of the air vent <NUM> wherein spring <NUM> allows to remain close air vent <NUM> by means of compression force. Another way, the spring <NUM> said main spring is mounted onto sealing disk <NUM> which allows to close mainly water path <NUM> and air path <NUM>. The valve body <NUM> comprises water intake and water outlet which can be controlled by means of piston <NUM> by means of solenoid coil wherein solenoid coil <NUM> controls the movement of upward or downward of the said piston <NUM>.

In one of the preferred embodiment <FIG> a cross-sectional view of an auto drain valve <NUM> wherein water from the fuel tank is collected into bowl <NUM>. Filter screen <NUM> allows water to enter into drain system. An auto drain valve <NUM> having solenoid coil <NUM> surrounding Piston <NUM> a single body wherein, piston rod <NUM> sealing disk <NUM> with rubber O ring <NUM>, sealing member <NUM> is assembled in valve body, with water level indicator sensor.

<FIG> of the Piston <NUM> sealing of air vent <NUM> and the liquid outlet <NUM> wherein the spring <NUM> is located onto sealing member <NUM> sealing the air vent <NUM> by means of compression force and spring <NUM> said main spring is mounted on sealing disk <NUM> which seals water vent <NUM> and thus close water path <NUM> and air path <NUM> simultaneously.

The auto drain valve <NUM> when solenoid coil <NUM> is in de-energized wherein drain water is collected into bowl <NUM> which restricted by means of sealing member <NUM>, which is located onto piston rod <NUM> of the Piston <NUM>. During de-energized condition both air vent <NUM> and water path <NUM> are closed means air can't enter into the valve body and water does not vent from the valve body. <FIG> of the present invention discloses energized condition of the auto drain valve <NUM> wherein solenoid <NUM> is energized and said solenoid <NUM> lifts piston rod <NUM> towards up direction against compression force of main spring <NUM> and springs <NUM> which open air vent <NUM> and water vent <NUM> simultaneously. At the time of opening of air vent <NUM> and water vent <NUM>, the air will enter into the bowl <NUM> through valve body <NUM> that denotes air path <NUM> into the <FIG>. <NUM> denote same way water path, which discloses water drain from bowl <NUM>. While, in the energized condition of solenoid coil <NUM> as shown by the <FIG> water from bowl <NUM> is entered through opening <NUM> of filter screen <NUM> and using the radial gap <NUM> [refer to <FIG>] at the outer periphery of sealing disk <NUM> water is further conveyed to the central recess <NUM> of piston rod <NUM> for draining of water from liquid outlet <NUM>, using the water path <NUM>.

<FIG> of the preferred embodiment wherein solenoid coil <NUM> in de-energise and energise condition of said valve <NUM> wherein <FIG>depicts solenoid coil <NUM> in de-energise condition wherein water drain path <NUM> and air vent <NUM> of the air vent path are sealed by O ring <NUM> respectively by the compression force of the spring <NUM>. <FIG> depicts solenoid coil <NUM> in energise condition of said valve <NUM> wherein electric current flows into solenoid coil as solenoid coil <NUM> generates magnetic field. Due to magnetic field, a Piston <NUM> with piston rod <NUM> connected piston tarts to move upward direction against compression force of spring <NUM> sealing members <NUM> and sealing disk <NUM> with rubber O-ring <NUM> are rigidly fixed to seal Air vent <NUM> and liquid outlet <NUM> simultaneously. As sealing disk <NUM> starts to move upward direction; rubber O ring <NUM> opens water path <NUM> and air vent <NUM> path respectively.

The solenoid coil <NUM> controls Open and close of the water drain path <NUM> and air vent <NUM> simultaneously.

A solenoid <NUM> (<FIG>), surrounds the Piston <NUM>, and when energized moves the valve Piston <NUM> against the bias of the spring <NUM> away from the stop position. A sealing disk <NUM> with at least one sealing member <NUM> is mounted on the Piston <NUM> with a spring <NUM> and spring <NUM> that resiliently biasing the Piston <NUM> into sealing engagement to seal air vent <NUM> with the sealing member <NUM> and liquid outlet <NUM> with the sealing disk <NUM> when the Piston <NUM> when solenoid coil <NUM> is in de-energized condition. In this preferred embodiment, the spring <NUM> and spring <NUM> is a coil spring, but the spring <NUM> spring <NUM> could be any other element for applying a resilient force to the valve Piston <NUM>, biasing it toward the de-energized condition.

The spring <NUM> and spring <NUM> biases the Piston <NUM> to seal toward the seal air vent <NUM> with the sealing member <NUM> and liquid outlet <NUM> with the sealing disk <NUM> by means of compression force. When the solenoid <NUM> is energized, it moves the Piston <NUM> against the bias of the spring <NUM> and spring <NUM> away from the air vent <NUM> and liquid outlet <NUM>, so that the valve is open, and air will enter into the bowl <NUM> through valve body <NUM> and air path <NUM> and liquid is drained form bowl <NUM> through liquid inlet <NUM>' into valve body <NUM> and drained out form liquid outlet <NUM>. When the solenoid <NUM> is de-energized, the spring <NUM> and spring <NUM> biases the Piston <NUM> to seal toward the air vent <NUM> with the sealing member <NUM> and liquid outlet <NUM> with the sealing disk <NUM> by means of compression force. The Piston <NUM> contacts the valve air vent <NUM> and liquid outlet <NUM> stops moving, the Piston <NUM> by the spring <NUM> and spring <NUM>, until the Piston <NUM> seals air vent <NUM> and liquid outlet <NUM>, which arrests further movement of the Piston <NUM>. Thus the air vent <NUM> and liquid outlet <NUM> open and close simultaneously which reduced fuel or water spillage during the draining.

As shown in <FIG> and <FIG>, the piston <NUM> comprises a piston rod <NUM> and a sealing disk <NUM> and sealing member <NUM> attached to one end of the rod <NUM>. The sealing disk <NUM> is designed to create a sealing engagement with a drain / liquid outlet <NUM> and an air inlet / air vent <NUM> of the auto drain solenoid valve <NUM> when the piston <NUM> is in the closed condition (as shown in <FIG>). The piston <NUM> slides within Anchor <NUM> and fixed guide <NUM>, which is mounted into valve body <NUM>.

A bowl <NUM> is connected to fuel tank (not show in figure) open in one end for receiving liquid containing water form fuel tank and other end of the bowl <NUM> is connected to the valve body <NUM>. The mouth of the valve body <NUM> has a liquid inlet <NUM>' and a piston <NUM> comprising piston rod <NUM> with sealing disk <NUM> and sealing member <NUM>. In the preferred embodiment, the sealing disk <NUM> and sealing member <NUM> may be made of a lightweight fluorinated hydrocarbon polymer such as Teflon, or other polymeric or resilient sealing material, or a combination of different materials bonded together. The piston <NUM> comprising piston rod <NUM> with sealing disk <NUM> and sealing member <NUM> sealingly engages the liquid outlet <NUM> and air vent <NUM> in a closed position when the solenoid <NUM> is not actuated. When the solenoid <NUM> is actuated, the piston <NUM> comprising piston rod <NUM> with sealing disk <NUM> and sealing member <NUM> moves away from the liquid outlet <NUM> and air vent <NUM>. The initial movement of the piston <NUM> before the valve element <NUM> moves provides an impact to the valve element that helps unseat the valve element. As described above, when the solenoid <NUM> is de-actuated the spring <NUM> and spring <NUM> moves the piston <NUM> comprising piston rod <NUM> with sealing disk <NUM> and sealing member <NUM> toward the liquid outlet <NUM> and air vent <NUM>. The sealing disk <NUM> and sealing member <NUM> contacts the liquid outlet <NUM> and air vent <NUM>, and further movement of the piston <NUM> under the bias of spring <NUM> and spring <NUM>. Thus, while the piston <NUM> operated by the solenoid <NUM> and to close the liquid outlet <NUM> and air vent <NUM> quickly when the solenoid is de-actuated, the impact of the sealing disk <NUM> and sealing member <NUM> moving toward its closed position, thereby preserving the life of the piston <NUM>. Testing of one preferred embodiment of a solenoid valve incorporating the principles of the present invention has yielded <NUM> million cycles of flow control operation at <NUM> psig. Thus, the present invention to provide an economical robust valve design that can operate for a significant number of cycles without failure by significantly reducing the impact force of the valve against the valve seat when the valve is closed.

One of the embodiments of the present invention is to provide an auto drain valve wherein manually drain mechanism is also available in any emergency conditions. Manually mechanism to control valve comprises a screw mechanism or manual switch which energized solenoid manually.

In another embodiments of the present invention is to provide an auto drain valve which is easy to disassemble for maintains wherein bowl comprises threading mechanism which is easy to disengage said drain valve from fuel system. The present invention does not limit its scope by providing only threading mechanism but it can be any mechanism which can be detachably attached the said valve with fuel system.

In another embodiments of the present invention is to provide an auto drain valve having a water level indication sensor allows to energise drain valve system by reaching water at predefined level. Water sensor is located into the bowl wherein said sensor measures the level of water and drain said water automatically.

Claim 1:
An auto drain valve (<NUM>), comprising:
a bowl (<NUM>);
a valve body (<NUM>) connected to the bowl (<NUM>) for receiving flow of water from the bowl (<NUM>) through a filter screen (<NUM>), the valve body (<NUM>) comprising:
an air vent (<NUM>) receiving flow of air from an air path (<NUM>),
a liquid outlet (<NUM>) receiving flow of water from a water path (<NUM>) simultaneous to the inward flow of air through the air vent (<NUM>), and
a liquid inlet (<NUM>') for the inlet flow of water into the water path (<NUM>);
a piston (<NUM>) having a piston rod (<NUM>) connected at one end with a sealing disk (<NUM>), wherein sealing members (<NUM>) are attached to the sealing disc (<NUM>), and said piston rod (<NUM>) connected with the valve body (<NUM>) at opposite end,
wherein the piston (<NUM>) is configured to slide within an anchor (<NUM>) and a fixed guide (<NUM>) placed into a cavity of the valve body (<NUM>), wherein the anchor (<NUM>) and the fixed guide (<NUM>) are configured to support the piston rod (<NUM>);
a solenoid coil (<NUM>) surrounding the piston rod (<NUM>) for moving the piston rod (<NUM>), in an energized condition, to allow flow of water into the water path (<NUM>); and
a first spring (<NUM>) mounted onto the sealing disk (<NUM>) to resiliently bias the piston (<NUM>) to seal the liquid outlet (<NUM>) with the sealing disk (<NUM>) to prevent flow of water into the water path (<NUM>), and second springs (<NUM>) located onto the sealing members (<NUM>) to resiliently bias the sealing members (<NUM>) to seal the air vent (<NUM>) to prevent flow of air to the bowl (<NUM>),
and by means of compression force when the solenoid coil (<NUM>) is in its de-energized condition;
wherein the solenoid coil (<NUM>) is configured to, in its energized condition, move the piston (<NUM>) away from the air vent (<NUM>) and the liquid outlet (<NUM>) simultaneously, to enable air to enter into the bowl (<NUM>) through the air path (<NUM>) and the water to be drained from the bowl (<NUM>) through the liquid inlet (<NUM>') into the water path (<NUM>) and drained from the liquid outlet (<NUM>), and
the sealing disk (<NUM>) includes an O ring (<NUM>) configured to close the liquid inlet (<NUM>') to seal the water path (<NUM>) and the air path (<NUM>), when the piston (<NUM>) is resting against the air vent (<NUM>) and the liquid inlet (<NUM>') under the compression force of the first spring (<NUM>) in the de-energized condition of the solenoid coil (<NUM>).