Lift Check Valve


Coosai steel check valve has three designs of bonnet. Firstly, bolted bonnet, with its body and bonnet bolted, spiral wound gasket (made of 304 embedded with flexible graphite) sealed. It can also be metal ring junction in case of user's special request. Secondly, welded bonnet, with its body and bonnet threaded, all welded seal.It can also be all penetration welded in case of user's special request. Thirdly, pressure self-tightening bonnet, with its body and bonnet threaded, inside pressure self-sealing ring sealed.

Forged steel check valve has three structure designs, namely lift check valve,ball check valve and swing check valve.


Applicable Standards


· Design Standard: API 6D, API 594, BS1868, API602

· Structure: Bolted Bonnet, Welded bonnet, Pressure seal, Double disc, Tilting disc,”Y” pattern,Non Slam design.

· Operation: Damper and counterweight(optional)

· Nominal Dimension: Casting Valve: 2”-48”, Forging Valve: 1/4"~2"

· Nominal Pressure: Class 150-2500

· Connection type: RF,RTJ,FF, SW, NPT, BW

· Material:DI, CS, SS, DSS,LTCS, Inconel ,Monel, Bronze,Aluminum Bronze




Coosai steel check valve has three designs of bonnet. Firstly, bolted bonnet, with its body and bonnet bolted, spiral wound gasket (made of 304 embedded with flexible graphite) sealed. It can also be metal ring junction in case of user's special request. Secondly, welded bonnet, with its body and bonnet threaded, all welded seal.It can also be all penetration welded in case of user's special request. Thirdly, pressure self-tightening bonnet, with its body and bonnet threaded, inside pressure self-sealing ring sealed.

Forged steel check valve has three structure designs, namely lift check valve,ball check valve and swing check valve.


Applicable Standards


· Design Standard: API 6D, API 594, BS1868, API602

· Structure: Bolted Bonnet, Welded bonnet, Pressure seal, Double disc, Tilting disc,”Y” pattern,Non Slam design.

· Operation: Damper and counterweight(optional)

· Nominal Dimension: Casting Valve: 2”-48”, Forging Valve: 1/4"~2"

· Nominal Pressure: Class 150-2500

· Connection type: RF,RTJ,FF, SW, NPT, BW

· Material:DI, CS, SS, DSS,LTCS, Inconel ,Monel, Bronze,Aluminum Bronze




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