Precautions to Be Observed When Installing Steam Safety Valves MountingDespite the roughhewn outward appearance of safety valves, they are very delicate products comprising precision‐machined internalcomponents. For that reason, users are encouraged to gain full understanding of safety precautions and the manual. Especially with regardto safety valve installation, refer to the following cautions, to standards, product manuals, and other materials because failure to do this couldresult in leaks, malfunctions, or other problems by imposing an excessive load on a valve, or by piping designs or other configurations thatcause pressure loss. Safety valves also require regular maintenance (every year or every other year). Safety valve care and maintenanceshould be left to specialized engineers sufficient training. Our service department provides round‐the‐clock service by full‐time staffengineers. Please give us a call when you need safety valve maintenance and regular servicing.
■ Safety precautionsThe following categories are used to explain the extent of danger damage that is anticipated if cautionary information is ignored productsare incorrectly used.
Indicates an imminently hazardous situation which, if not avoided, will result in death or serious injury.
Indicates a potentially hazardous situation which, if not avoided, could result in death or serious injury.

Operation and UsePrecautions to Be Observed WhenInstalling Steam Safety Valves MountingReceivingand StorageIndicates a potentially hazardous situation which, if not avoided, may result in minor or moderate injury.

Stay out from under safety valves suspended in the air.
To prevent accidents caused by dropping valves, keep them as near a vertical position as possible when suspending with a crane or other device.
Never go under a suspended valve. Use appropriate equipment after checking the valve’s weight.
Do not use the lever or cap to lift a safety valve.
Avoid using parts such as the lever or cap to suspend a valve because this could affect valve performance.
We recommend winding a wire or nylon sling around the valve outlet neck and the bonnet or yoke.
Do not let valves tip over.
Many safety valves have curved shapes and are therefore highly unstable. Do not try to stack them in storage because they could tip and bedamaged.
Store safety valves indoors.
Safety valves should be kept indoors when in storage before mounting. If indoor storage is impossible, shroud completely wi h a waterproof tarp orother covering to prevent exposure to the elements.
Mount the safety valve directly on the mounting connection in an upright position.
Mount the valve in an upright position on the boiler or the mounting connection. Mounting an incline could cause poor tightness and unstableoperation. The permissible deviation from the vertical is within ±1°.
Use care in tightening the flange bolts.
When mounting a safety valve, first remove the inlet and outlet protective covers and make sure there is no foreign matter. When mounting a flangedvalve, be sure that the flange gasket dose not protrude, and tighten the flange bolts alternately to ensure they are all tightened equally.
Improper bolt tightening could cause steam leaks and pose the danger of burns by leaked steam.
The safety valve inlet connection must be at least as large as the valve inlet diameter.
The inside of the safety valve’s mounting connec ion should save rounded corners and its inside diameter should be at least the same as the valve’snominal to ensure the smooth flow of steam from the boiler to the valve. We recommend that the R dimension of the inlet pipe’s inside diametercorner is at least one‐fourth the inside diameter.
Pressure loss at the safety valve inlet should be under 2%.
See that the pressure loss from the connection to the valve is under 2% of the valve’s set pressure. A large pressure loss presents the danger ofchattering when the valve operates.
When a valve is installed on an elbow, provide for a generous radius as well as appropriate supports for curved attachments.
Mount safety valves a sufficient distance away from joints and other valves.
When installing a safety valve on a pipe line, make sure it is sufficiently distant from joints or other valves that disrupt the fluid flow. A safety valvemust be at least the approximate distance of 10 X D (where D is pipe diameter) from these other fixtures, both upstream and downstream. Do notinstall a branch‐pipe in a position that is symmetrically opposite the safety valve. When installing two or more safety valves on the same header orline, be careful of the distance between valves. A malfunction could result from unevenness in the pressure distribution if all safety valves actuate atsame time.
Be careful of safety valve blowoff recoil.
A exhaust pipe’s diameter must be at least as large as the safety valve’s outlet diameter, and the distance from the valve axis to the center of theexhaust pipe must be less than four time the ou let diameter. The pipe must be as short as possible and lead outdoors without bends; its structuremust be as simple and sound as possible. Back pressure arising in the exhaust pipe when the valve operates must not exceed 10% of the setpressure because it could cause unstable operation. Adopt piping arrangements that will not allow excessive impacts on the safety valve fromthermal expansion of the boiler, other equipment and the exhaust pipe, or other causes. If you attach a drain pipe to the exhaust pipe, make sure theend is open.
Do not restrict safety valve actuation with drain pipe.
Be sure to provide a safety valve with a drain pipe to drain away rainwater, and the condensed water that forms during a safety valve blowoff. Takecare to provide a drain pipe that is independent of other piping, and does not restrict the valve. Leave the lower end open; do not attach a cock orvalve.
Be careful of test pressure when performing hydrostatic pressure tests.
When pressure testing a safety valve, carefully watch the test pressure and be sure never to exceed it. Some valves have a water pressure plug unthe nozzle seat for pressure testing. Be sure to remove the plug after testing but before starting operation. See the manual for details.
Use a safety valve’s lever only when necessary.
Do not touch or lift a safety valve’s lever except when there is a need to use it. Unnecessary use could cause improper functioning.
Do not use safety valve as a foothold.
Never use an installed safety valve as a foothold when performing a task. This could damage the valve, and is also dangerous should the valveoperate.
Carefully choose where safety valves are installed.
If a safety valve is installed near a heat source, or where it is exposed to a cold air current, such external thermal influence could cause unevenexpansion or contraction, bringing about a malfunction or poor tightness. In such a case, change the installation location, provide for heat retention,and take other measures. If lagging is used, cover the valve midsection down to the bottom, taking care not to cover the adjustment lock bolts.
Be careful of pressure when removing or dismantling a safety valve.
When removing a safety valve for regular servicing or other purposes, or dismantling a valve in a condition of being installed on equipment, beginwork only after making sure there is no internal pressure in order to eliminate the danger of a serious accident.
Provide access space around a safety valve.
Leave open space around a safety valve to facilitate dismantling, inspection, and adjustment. Dismantling requires open space above a valve aswell, so make sure it is possible to attach a chain block for lifting a valve.SJ / SL / PCV SeriesSL8Code S ystem

16-7-H1-C3(T)Cap codeVersion codeBody material codeSpecial connection codeInlet connection codeTemperature classification codePressure class codeSeries codeSpecialconnectioncode-3-4-5-6-7JIS B8210Welded typeShippingclassSJ－◎◎ ○ ◎ ◎SL◎◎-◎ ○ ◎PCV

◎

◎

-◎

-

◎RPE

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-NumberJIS B2220ASMESymbolASME , JPIRegulation code Inlet connectionor standardstandardASME , JPIJIS B8210ASME , JPIJIS B222030K40K300#600#900#1500#2500#30K40K63K--No number is shown when nominal pressure for the inletconnection is the same as pressure class code.

Inlet connection codeJIS B8210Inlet connection codeJIS B2220#10KBodymaterialcodeNon code-C2-C3-C4-CAMaterialJIS notationASME notationSCPH2SCPH21SCPH32SCPH61火 SCPH91SA216M-WCBSA217M-WC6SA217M-WC9SA217M-C5CASE 2192110K150220K300#20K30K40K#300600#30K40KVersioncodeNon code900#63K-H2-1500#--MSL400～5007-2500#--M2SL400～6008-2500#SL700～100095%3456--H1# １Pressure class code*2SeattightnessSL100～30090%94%9-3000 *--H2SL700～80093%10-4500# *１-PAEach SL series Air drive98%-ARPCV100～1000 Air drive100%-ERPCV100～900 Sorenoid drive100%Non codeRPE300～700 Main Valve90%*1. Welded type onlyInlet connectioncodeInlet connectionstandard

1ASME

2JPI

3Welded type

4JIS B22205
9special connectionJIS B8210*2. set pressure×( )%CapcodeConstruction(C)Open lever(T)Open lever with test gag-4-Temperatureclassification codeMaximum servicetemperature3400℃（750゜F）5510℃（950゜F）6571℃ （1060゜F）7621℃ （1150゜F）Ｓ Ｊ/ Ｓ Ｌ１ （ ）９～３（ ） ９ Series Parts MaterialsTypeＳＪ（ ）３（ ）ＳＪ（ ）５（ ）ＳＪ（ ）６（ ）Maximum Temperature４００゜Ｃ７５０゜Ｆ５１０゜Ｃ９５０゜Ｆ５３８゜Ｃ１０００゜ＦSA105MSA182M-F12SA182M-F22Nozzle *1SUS630 (≦320℃ ) or B637-N07750 (＞320℃ )DiscDisc CollarSUS630HolderSUS420J2BodyYokeSA216M-WCBYokeSA216M-WCBSA217M-WC9SA217M-WC6Spindle GuideSpindleParts NameSA217M-WC6SUS630SUS403SUS431GuideSUS420J2 or SCS1Upper or Lower RingSUS304 or SCS13AUpper Lock BoltSUS403SUS431Lower Lock BoltSUS403SUS431Upper or Lower Spring WasherSUS403SpringCarbon Steel or Alloy SteelAdjusting ScrewSUS420J2Adj. Screw Lock NutSUS304Lift StopperSUS420J2Step RingSUS420J2Stud Bolt & NutSNB7 / S45CSNB7 / S45CCapFCD450-10Fork LeverFCMB310-8Easing LeverFCMB310-8PinSUS304Adjust Needle／Adj. Lock Nut *2SUS304 / SS400Adjustment Valve *2SCS13*1：Bishilite deposited on the seat surface.
*2：Either the back pressure adjustment needle or the back pressure adjustment valve is the manufacturerstandard for the back pressure adjustment mechanism.

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