Working principle:

As a pressure relief valve: When the pressure relief/holding pilot valve is adjusted to the pressure relief state, water flows to the outlet through the needle valve, the main valve control room, the ball valve, the pressure relief/holding pilot valve, the ball valve, and the main valve is in the open state. When the inlet pressure exceeds the safe value set by the relief/holding pilot valve, the relief pilot valve will automatically open and release some water through the ball valve to relieve pipeline pressure. When the pressure returns to a safe value, the pressure relief valve automatically closes. As a pressure relief valve, the ball valve is usually open.As a holding valve: When the relief/holding pilot valve is adjusted to the holding pressure state, as long as the main valve inlet water pressure is lower than the set value of the pilot valve, the pilot valve is closed. Main control room pressure increase, main valve closed. When the
upstream water supply pressure of the main valve exceeds the set pressure of the pilot valve, the pressure holding pilot valve can only be opened. The water in the control room is discharged to the outlet through the ball valve, and the pressure reducing main valve in the control room is opened to start water supply, that is, the upstream water pressure is maintained. When used as a pressure holding valve, the ball valve is normally closed or replaced with a wire plug.

Technical parameters:

Nominal Model:DN50-DN600
Nominal Pressure:PN16 N25
Applicable Temperature:0℃-80℃
Applicable Medium:Water
Nominal Pressure:1.0Mpa-2.5Mpa
Design Standard:JB/T 10674-2006
Test Standard:GB/T13927-2008

Main material：

lnstallation diagram：

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