Backflow Preventor Anti-Pollution Antifouling Cut off Block Valve (HS42X)

• Media: Water, Steam, Oil, Gas etc
• Temperature: Ordinary Temperature
• Material: Ci, Di, CS, Ss etc
• Connection Form: Flange
• Structure: Combined One Piece Type
• Pressure: Ordinary Pressure
• Model NO.: HS42X
• Function: Anti-Back Flow, Anti-Pollution
• Sealing Form: NBR/ EPDM/ Viton
• Flow Direction: Unidirection
• Standard: ANSI, API, DIN, BS, GB etc
• Application: Industrial Usage, Water Industrial Usage, Household Usage
• Certificate: ISO, Ce
• Transport Package: 1. Inner: Plastic Package2. Outer: Plywood Case
• Specification: DN40 ~ DN600
• Trademark: KARFAR
• Origin: China
• HS Code: 8481804090
• Production Capacity: 5.000PCS/Month

Product Description

Backflow preventor Anti-Pollution Antifouling Cut off Block Valve (HS42X)

Conventional type anti-pollution cut off/block valve is composed of two check valves in tandem together.
Safety type anti-pollution cut off valve is to add to a drainage and decompression device to the secondary check valve system. In this case, even if all the secondary check seals are broken together, it still can function to prevent back flow. Therefore, it is a safety device to prevent back flow pollution in pipeline of daily drinking water system. Safety type anti-pollution cut off valve is composed of secondary check valve and a drainage and decompression system. The upper cavity connects with the inlet of first-stage non-return system. The first and second stage check valve system mainly consists of valve body, inlet connector, disc, gasket, spring, etc. Drainage and decompression system mainly consists of valve bonnet, diaphragm, gasket, outlet, spring and air block device. 

Medium applicable	Water, Oil, Gas and etc.
Main material	CAST IRON,ASTM A216 WCB, WCC, WC6, SS304, SS316, CF8, ETC.
Temperature applicable	≤80ºC
Nominal Pressure	PN10--PN25
Nominal Diameter	DN40--DN600
Flange Dimension	ASME B16.5, BS4504, ISO2531, ISO7005 and other standards conforming to the requirements
Face to Face Length	API594,BS5155, ISO5752, DIN3352 and other standards conforming to the requirements