China Cryogenic Stainless Steel Manual Check Valves, Find details about China Check Valve, China Check Valve Manufacturers from Cryogenic Stainless Steel Manual Check Valves
Globe valve is designed with a stem that moves up and down to regulate flow inside the valve, a disc (ball, composition or plug) and seat, which is generally screwed into the valve body. Seats are designed in plane parallel or inclined to the line of the flow. These types of modulating valves are most commonly used to valve throttle, open or close flow in a system. The advantages are it can be used as a stock check, shorter strokes than other valves such as gates and good at throttling flow.
Stainless steel + flexible graphite wounded gasket is used for Class150 and Class300 check valve; Stainless steel + flexible graphite wounded gasket is used for Class600 check valve, and joint gasket is also optional for Class600 check valve; Ring joint gasket is used for Class900 check valve; Pressurized seal design is used for Class1 500 ~ Class2500 check valves.
The body and bonnet of Class150 ~ Class900check valves are usually with studs and nuts. And the body and bonnet of Class1500 ~ Class 2500 check valves areusually of pressurized seal design.
Bolted Bonnet;Swing and lift disc;Metllic seating surfaces.
For carbon steel check valve, the seat is usually forged steel. The sealing surface of the seat is spray welded with hard alloy Specified by the customer. Renewable threade dseat is used for NPS≤10 check valves, and welded on seat can be also optional if being requested by the customer. Welded on seat is used for NPS≥12 carbon steel gate valves. For stainless steel check Valve, integral seat is usually adopted, or to weld hard alloy directly integrally. Threaded or welded on seat is also optional for stainless steel check valve if being requested by the customer.