YQ98002 type filtering piston type safety pressure relief valve upstream pressure P1 through the constant pressure pilot valve and control valve into the upper part of the piston control room, and then through the constant pressure pilot valve to the outlet. Adjusting the positioning pilot valve can be set to open the pressure, when the pressure exceeds the set value, the constant pressure pilot valve open, the main valve is also followed to open, so as to discharge system pressure to ensure the safety of the system. Safe pressure relief function.
The valve is widely used in water supply and drainage, fire, power plants and other industries in the water pipeline, pressure fluctuations can be rapid response and rapid discharge, to prevent a sharp increase in pressure and damage to the pipeline and

Part name	Texture of material
Valve body, valve cover	Cast iron, cast steel, stainless steel
valve seat	Tin bronze, stainless steel
Valve	Carbon steel, stainless steel and nitrile rubber
The stem	Aluminum steel, chromium stainless steel
piston	Chromium stainless steel + nitrile rubber
Filter screen	Stainless steel
Filter screen	Stainless steel

Nominal pressure PN（MPa）	1.6	2.5
Nominal diameter DN（mm）	40 50 65 80 100 150 200 250 300
Strength test pressure （MPa）	2.40	3.75
Seal test pressure （MPa）	1.76	2.75
Setting pressure range	0≤1.6MPa	0≤2.5MPa
Applicable temperature	0～100℃
ambient temperature	-30～350℃
Applicable medium	water

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1 setting pressure accurately, can be long-term stable, once the overpressure can be quickly pressure relief.
2 elastic soft seal, ensure the reliability of water, not humble.
3 Y wide body cavity raft, small flow resistance, cavitation resistance, no noise.
4 piston drive, stable and reliable.
5 can be installed at any angle.
6 the internal and external surfaces are sprayed with environmental protection coating, to ensure the products to ensure the product to prevent corrosion and safety.