Bolted bonnet, swing and lift the valve sealing surface of metal. Connection forms of body and bonnet Class150~Class900 using bolted bonnet; Class1500~Class2500 uses a pressure seal bonnet.

Valve cover gasket forms

Class150~Class300 check valve stainless steel graphite spiral wound gasket; Class600 check valve can be made of stainless steel graphite spiral wound gasket also can uses a metal ring gasket; Class900 check valve can adopt metal ring gasket, Class1500~Class2500 check valve adopts the sealing metal ring.

Valve seat

Check valve seat usually uses the forged steel material, sealing surface of the valve seat can be based on customer requirements of spray welding hard alloy, NPS ≤10''check valve adopts separated type screwed type valve seat, if the user need welding seat structure may also be provided; NPS ≥ 12check valve adopts a welding seat structure; stainless steel check valve valve seat adopts the integral type or in body welding hard alloy after direct machining valve seat. If the user demand, stainless steel check valve can also be used for separating type screwed type and welded seat structure.

Cast steel swing check valve structure characteristics

Large diameter check valve design rings, convenient lifting.

Bolted bonnet, the flange gasket type according to different levels of selection pressure;

CLASS600 check valve can use pressure SelfTight seal structure.

Valve limiter device, to prevent the valve open position is too high and can not be closed.

The solid pin shaft mounting precision, high strength, ensuring the valve performance and life

The rocker has enough strength, turn off when there's enough freedom to facilitate closure of the valve flaps.

Valve flap has sufficient strength and stiffness, valve sealing surface can be based on user requirements of surfacing metal material or embedded nonmetal materials.