X500X holding pressure relief pressure valve

The principle of the 500X  holding/relief pressure valve:

The inlet sade of the main valve is connected to the pilot valve voa a control pipe ,when the pressure on the said is over the one set with the pilot  valve,the pilot valve is opend to release the pressure in the upper cavity of the diaphram and the main valve disc is opened accordingly. when the pressure of the main valve is released to the set one,the pilot valve is closed ,so does the main valve.

The purpose of the 500X  holding/relief pressure valve:

This valve is used for the high bulding fore fighting system .when the pressure in the water supply pipeline is over  the setone for the pressure releasing valve ,the said valve is opend to prevent the pipeline and equiment against damage due to an exessive pressure;then when the pressure lower to the set valve,automatiocally closed.

The characterisitic of the 500X holding/relief pressure valve:

The body uses full passage streamilne design,of a small fluid resistance and a heavy flow. this valve can be used as either a pressure releaseing or holding valve.when used as the former,it can release the pressure surpassing the safe valve set with the pilot valve and keep the pressure inside of the pipeline below the safe valve to prevent system against danger due to an excessively high water supply