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DIN Standard Safety Valve Features:
Safety valves were first used on steam boilers during the
industrial revolution. Early boilers without them were prone to
accidental Explosion.
Safety valves also evolved to protect equipment such as pressure
vessel (fired or not) and heat exchangers. Safety valve term should
be limited to compressible fluid application (gas, vapor,
steam).
The two general types of protection encountered in industry are thermal protection and flow protection.
For
liquid-packed vessels, thermal relief valves are generally
characterized by the relatively small size of the safety valve
necessary to provide protection from excess pressure caused by
thermal expansion. In this case a small valve is adequate because
most liquids are nearly incompressible, and so a relatively small
amount of fluid discharged through the relief valve will produce a
substantial reduction in pressure.
DIN
Standard Safety Valve Specification
Type |
Nominal Pressure |
Body Material |
Nominal Diameter |
Working Temp. |
**1/**2/**1/**2 |
PN*0/*6 |
1.***9+N |
DN*0/**-DN**0/**0 |
**0C~**0C |
**1/**1 |
PN*0/*6 |
1.***8 |
DN*0/**-DN**0/**0 |
**0C~**0C |
DN |
*0/*2 |
*5/*0 |
*2/*0 |
*0/*5 |
*0/*0 |
*5/**0 |
*0/**5 |
**0/**0 |
**0/**0/ |
**0/**0 |
Throat Diameter do (mm) |
*8 |
*2 |
*9 |
*6 |
*5 |
*8 |
*2 |
*0 |
**0 |
**5 |
Orifice Area Ao(mm) |
**4 |
**8 |
**1 |
***8 |
***0 |
***8 |
***2 |
***2 |
***5 |
****6 |
Weight (Kg) |
8.5 |
*0 |
*4 |
*0 |
*8 |
*0 |
*3 |
*0 |
**5 |
**5 |
A full lift safety valve is one in which the disc lifts sufficiently, so that the curtain area no longer influences the discharge area. The discharge area, and therefore the capacity of the valve are subsequently determined by the bore area. This occurs when the disc lifts a distance of at least a quarter of the bore diameter. A full lift conventional safety valve is often the best choice for general steam applications.
Full lift safety valve opening height is more than one fourth times of the flow diameter. it has an advantage of discharging greatly .
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