Y50 Cast Iron, Carbon Steel Series Pressure Relief/Pressure Holding Valve (Flange Type)-China top 10 valve Manufacturers, Suppliers, Factory

01. Diameter range: DN50～400, DN>400 need to be customized
02. Applicable medium: Water, applicable medium temperature: Ib: -9～80℃, leakage amount: 0ml/min
03. Applicable pressure: Normal PN16bar, special PN10, 25bar, disc sealing material: Nitrile rubber (NBR, code: N)
04. Body material: Gray cast iron (code: C), ductile iron (code: Q), cast steel WCB (code: C)
05. This valve is generally installed in the upstream of high-rise buildings, living areas or other water supply pipe networks, and can be used

as pressure relief valves it can be used as a pressure holding valve. When used as a pressure relief valve, it can maintain the pressure of the

water supply circuit below the set safety value; Hold pressure when the valve is used, it can maintain the water pressure upstream of the ma-

in valve above the set value, and maintain the upstream water supply pressure of the main valve
06. The flow direction should be the same as the arrow direction on the valve body, can be installed at any angle, and the ball valve is in-

stalled downward to facilitate sewage cleaning and slag discharge

Component Material Table

Note: □---nominal diameter.

Structure Diagram

External Dimension (Pn16bar)

Note: The flange is manufactured according to JB/T79-1994 standard by default, also can be manufactured according to user-specified
standards, such as ANSI, JIS, DIN, GB/T9124, HG/T20592,etc.

Main Technical Parameter

Working Principle

When used as a pressure relief valve, the main valve is installed in the drainage bypass, that is, installed in parallel with the main pipeline. Water flows through the conduit at the inlet end and the regulating valve 08 flows into the upper cavity of the main valve diaphragm 05, while the water flow pressure at the inlet end acts on the pilot valve 10 and the main valve
valve, respectively on the flap 03, the main valve disc 03 is open, the ball valve 11 and the pilot valve 10 are closed, and the pressure in the upper cavity of the main valve diaphragm 05 rises high, the main valve opening decreases until it is closed. when the inlet pressure rises more than the set value of the pilot valve 10, the pilot valve is 10 dozen open, the medium in the upper cavity of the main valve diaphragm 05 flows out through the pilot valve 10, the pressure of the upper cavity of the main valve diaphragm 05 decreases, and the water flow at the inlet end the pressure is pushed open again on the main valve disc 03, and the main valve is opened and the water is released to reduce the pressure until the inlet water flow pressure
drops to the pilot valve 10 when the fixed value is below, the main valve closes slowly and smoothly, avoiding the occurrence of water hammer and ensuring the safety of the pipeline. when used as a pressure relief valve, it is mainly used to eliminate the excessive pressure that gradually increases due to excessive flow, such as the elimination of fire hydrant systems initial anti primary, automatic sprinkler and pump outlets for various water supply system. When the pressure holding valve is used, the main valve is installed on the main road, that is, it is installed in series with the main pipeline. As long as the supply upstream of the main valve when the water pressure is lower than the pilot valve set point, the main valve is closed. When the water supply pressure upstream of the main valve exceeds the pilot valve when the value is set, the main valve will automatically open and supply water downstream of the main valve, thus ensuring the water supply pressure upstream of the main valve. It is mainly used to maintain the minimum water supply pressure of the main pipeline of the city, especially in the event of a fire, to prevent excessive users of branch pipes. Pumping pressure reduction (Note: when the pilot valve 10 fails, the pressure can be manually relieved through the ball valve 11). Pilot valve pressure adjustment method: turn the adjusting screw 09 clockwise, the opening pressure of the pilot valve 10 increases, and rotates counterclockwise adjust the screw 09, and the opening pressure of the pilot valve 10 is reduced.

Keywords： Y50 Cast Iron, Carbon Steel Series Pressure Relief/Pressure Holding Valve (Flange Type)

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