VALVE

Abstract: A drive shaft (1) for fluid piping valves, comprising a cylindrical monopiece element provided in one extreme with a pin for connection with the valve control element (7) and in the opposite extreme with a conduct communicating with an orifice (3). The shaft consists of a semi-elastic material showing in the inner side surface of the conduc­ tion a thinned zone (2) which coincides in the closing position of the valve with the fluid outlet manifold (3). The shaft shows at the extreme adjacent to said pin a peripherical throat (4) determining the cover of the shaft in another zone (5) of a slightly bigger diameter forming a contact piece with the inner element of the valve.

Description: The present invention relates to a valve according to the preamble of the claim. Such a valve is disclosed in US-A-4,489,915. In this valve, the closure member is a metallic plug which can be submitted to an axial pressure deflecting the side walls of the plug through means for applying pressure such as a screw, a threaded collar, a.s.o. Such a valve arrangement is very complicate and certainly costly. It is an object of the present invention to provide a shaft for valves with some features overcoming the foregoing of the prior art known on the market and destined for analogous uses, besides bringing forward the necessary conditions for reducing the costs, as its manufacturing is obtained by moulding, in semi-elastic material, preferably plastic material, eliminating the mechanized processes which are needed for the traditional metallic shafts. In order to solve such problems, there was provided according to the invention a valve according to the claim. The advantages of the present invention with respect to the conventional shafts of rigid material reside in the fact that in the inner passage of the shaft in question exists a thinned zone or zone which material was cut down or lowered which coincides with the fluid outlet manifold when the valve is closed so that the pressure exerted by the fluid onto the thinned zone determines a tighter closing than the one effected by the mentioned shafts of rigid material, due to the fact that the cited thinned zone provides a better adjustment to the outlet manifold, consequently improving the sealing. Another feature of the present shaft is the peripherical throat determining an extreme cylindrical portion of a bigger diameter than the one of the shaft. This cylindrical zone acts as a contact piece with the valve member, really determining the total watertightness of the same, working as a ring or tightness joint. Besides the before mentioned advantages, the shaft consists of semi-rigid material, allowing to attain with one sole piece the function of the whole tightness system of the valve, therefore eliminating the traditional ring joints, sealing packings, etc. The above brief specification, features and advantages of the present invention will be more fully appreciated by reference of the following detailed description of a presently preferred embodiment when taken in conjunction with the accompanying drawings, wherein : Fig. 1 illustrates the shaft in an end view. Fig. 2 illustrates an upper view of the former figure. Fig. 3 is a diametral section of the shaft. Fig. 4. illustrates said shaft seen from its under side. Fig. 5 is a sectional view of the drive shaft mounted in a fluid piping valve. And as to such figures the referred improved object consists of a shaft designated -1- destined to drive fluid piping valves. Said shaft -1- is of semi-elastic material and characterized by showing on the surface of its inner conduction a thinned zone or a zone which material is cut down designated with -2-, which coincides with the fluid outlet piping -3- when the valve is closed, so that the pressure exerted by the fluid on said thinned zone determines a tighter seal than the one effected by the conventional shaft of rigid material, due to the fact of producing a better adjustement of the thinned zone -2- to the outlet manifold -3-. Another new feature of the shaft -1- consists in providing the same with a peripherical throat -4- which determines the cover or cap of the cylindrical zone of the shaft in another zone -5- of a slightly bigger diameter, which constitutes the contact piece with the inner side of the valve element, determining the total water-tightness of the same, realizing the functions of the thightness seal or joint. The throat -4- facilitates the suitable flexibility of the zone of bigger diameter -5-, to allow the perfect adjustment of this last one to the inner side of the valve. The mentioned drive shaft -1- is connected by its end -6- with the control element -7- of the valve, as it is usual in such cases.

Claims: Valve comprising a valve housing having an inlet, an outlet (3) and a cavity extending therebetween, a valve closure member (1) received in said cavity of the valve housing, said closure member being a cylindrical monopiece element provided at one axial end with a pin (6) forming a connection portion with a valve actuating element (7) and provided at the other axial end with an axial blind bore and a radial orifice in its side wall, the said closure member (1) having a peripheral groove (4) in its external surface in the region of said one axial end, so that the said end is formed by a ring portion (5), characterized in that the said closure member (1) is made of semi-elastic material and is provided with a radially thinned or material lowered zone (2) in a circumferentially limited area of the inner side surface of the blind bore, said zone closing, in the closed position of the valve, the outlet (3) of the valve housing and providing a tight sealing under fluid pressure built up in the blind bore, and in that the ring portion (5) of the closure member (1) is of slightly larger diameter than the remaining part of the member (1), said ring portion (5) engaging the inner surface of the valve housing cavity in order to form a tight sealing area.

Inventors: FERRER BELTRAN, JOSE MARIA, Ferrer Beltran, José Maria
Applicants: FERRER BELTRAN, JOSE MARIA
Application year: 1988
Main classification: F16K5
IPC codes: F16K5, F16K41