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backflow prevention device piece DN50-DN300

plywood case
Place of Origin: 

Basic Info

Type: Direct-acting

Material: Cast Iron

Connection Form: Flange

Pressure: Ordinary Pressure

Actuator: Electric

Seal Surface: Wedge Gate Valve

Usage: Regulation

Standard: GB

Application: Industrial Usage, Water Industrial Usage, Household Usage

Size: DN40-DN450

Product Description

double Check Valve backflow prevention device piece Flow Control Valve DN50-DN300

Product Overview:

Backflow prevention device is a strictly limited water in a pipeline can only one-way flow of hydraulic combination control device, its function is in any condition to prevent the pipe back in the media, in order to achieve the purpose of avoiding backflow pollution.

Backflow prevention device working principle is to use the medium to flow through the inlet check valve for mechanical resistance and water head loss and decompression, so that the inlet pressure is higher than the drain valve cavity pressure, discharge valve diaphragm and upper pressure inlet pressure, the diaphragm upper pressure is greater than the drain valve cavity and a spring resistance, drain valve closed, medium normal flow, when the inlet pressure and outlet valve cavity pressure difference is less than 0.02Mpa, medium in the back of the critical state, the drain valve diaphragm upper pressure is smaller than the drain valve chamber and the pressure of the spring, the valve automatically opens, will return a medium discharge pipe, while a large number of air into the valve cavity, forming air cut off, put an end to the media back, more than 0.02Mpa drain valve automatic closing.

The valve after the pressure of the pipe network is elevated above the valve on water pressure, such as a second one-way check valve seal intact, water will not turn back, the drain valve is closed drainage, when a second one-way check valve seal failure leakage, drain valve open drainage pressure relief.

Installation position:

1 , the municipal pipe network access user water meter and valve in the pipeline between the back.

2 , fire pump adapter is introduced on the tube or the fire outlet.

3 , water supply system in the chemicals are injected into the water supply pipe.

4 , the water heater water inlet pipe, such as reflux may be generated with the water supply pipeline.


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