Temperature of Media:High Temperature, -20~180℃
Power:Manual
Media:Steam, Water, Gas
Port Size:25mm-320mm
Structure:Pressure Reducing
Item Name:Steam Pressure Relief Valve
Sealing:PTFE
Body material:Brass/ Stainless Steel/ WCB/ CF8M
MOQ:1 PCS
Flange Standard:AS, GB, DIN, JS
Thread:Flange
Certificate:CE, RoHS, ISO9001, TUV
Application:pipe, boiler
Pressure Relief Valve
A relief valve or pressure relief valve (PRV) is a type of safety valve used to control or limit the pressure in a system; pressure might otherwise build up and create a process upset, instrument or equipment failure, or fire.
As the fluid is diverted, the pressure inside the vessel will stop rising. Once it reaches the valve's reseating pressure, the valve will close.
full open type safety valve：
1.Size:1/2"~20" we can design for you as your use.
2.Pressure class:150lb~2500lb
3.Standard:API,JB,GB,DIN etc. or according to your requirements.
4. Painting and Brand: We can weld your logo and painting as you request.
5.The main Material: cast steel, carbon steel and stainless steel etc. we can do according to your requirements
Function:
A safety valve is used to automatically release material in order to change a system's temperature or internal pressure.
These mechanisms are very common on devices that use heated liquid, particularly water, to create mechanical energy.
The systems using safety valve usually have portions with extreme temperature,pressure or circulating liquid.
Devices such as steam boilers, hot water heaters and refrigeration systems all use safety valves as a method of keeping them from exploding.
When the pressure rises above a prescribed amount or temperature differences begin to endanger the system's physical structure, the safety valve will trigger to equalize the system
A balanced PSV is a spring-loaded PSV which incorporates a bellows of balancing the valve disc to minimize the effects of backpressure on the performancecharacteristics of the valve.
For conventional safety valve, total backpressure should not exceed 10% of the set pressure at 10% allowable pressure.However, it is possible to get valve with balanced bellows if total back pressure(superimposed + built-up) is up till 50% of the set pressure.
What is the advantage of balanced bellow pressure relief valve ?
Advantages：
1,Relieving pressure not affected by back pressure
2,Can handle higher built-up back pressure
3,Protects spring and guiding surface from corrosion
Disadvantages：
1,Bellows susceptible to fatigue/rupture
2,will release flammables/toxics to atmosphere in case of bellows rupture
3,Requires extended venting system for Bonnet vent to safe location
Selection Criteria：
Where the total backpressure (superimposed plus built-up) does not exceed approximately 50 % of the setpressure
What is the advantage of balanced bellow pressure relief valve：
A bellows with an effective area (A B ) equivalent to the nozzle seat area(A N ) is attached to the upper surface of the disc and to the spindle guide.
The bellows arrangement prevents backpressure acting on the upperside of the disc within the area of the bellows. The disc area extending beyond the bellows and the opposing disc area are equal, and so the forces acting on the disc are balanced, and the backpressure has little effect on the valve opening pressure.
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