5 replies to this topic

[Nirmal els]

It is to hard to differentiate PSV & PRV please furnish me detailed description about this.

[breizh]

Hi ,
Let you try this link , it will give some info about the equipment :

http://www.protectos...fTankSafety.cfm

Let you try the search button , top right corner you may find additional info.

Hope it helps

Breizh

[demank]

It is to hard to differentiate PSV & PRV please furnish me detailed description about this.

What you mean about PRV? Pressure Relief Valve or Pressure Reducing Valve?
If you mean that is Pressure Relief Valve, it is the same with PSV (Pressure Safety Valve) with relieving function.

[fallah]

It is to hard to differentiate PSV & PRV please furnish me detailed description about this.

No major difference!

A PRV is used primarily with incompressible fluids,

A PSV is normally used with compressible fluids.

[Modesty Blaise]

The names “safety” and “relief” are frequently used interchangeably but they should not be. Safety valves are for the compressible fluids: steam and other gases. This compressibility demands quick over pressure relief. So safety valves have pop seats and plugs which open rapidly on overpressure, relieving at full flow. They may discharge steam to atmosphere or direct a gas back to the system.
Relief valves are for the noncompressible fluids-liquids such as water and oil. Immediate full-flow discharge is not needed since a very small flow significantly reduces overpressure. So plug and seat open and close very slowly, discharging back to some low pressure point in the system to conserve the liquid.

[luuquocdai]

Following API Standard 520:
a. A relief valve is a spring loaded pressure relief valve actuated by the static pressure upstream of the valve. The valve opens normally in proportion to the pressure increase over the opening pressure. A relief valve is used primarily with incompressible fluids.
b. A safety valve is a spring loaded pressure relief valve actuated by the static pressure upstream of the valve and characterized by rapid opening or pop action. A safety valve is normally used with compressible fluids.
c. A safety relief valve is a spring loaded pressure relief valve that may be used as either a safety or relief valve depending on the application.

I think that it is very clear.