Bolted Bonnet Check Valves Size 4 Class150, ASME B16.34, GB 12236, API 6D 

Swing check valves are the most common and best check valve for general-purpose use. Of all check valve designs, these valves produce the lowest pressure drop, when compared with other check valves of the same size. They feature a simple design that is easy to maintain.
The swing check valve functions by allowing flow forces to move the disc from the closed position to the fully open position in a sweeping arc motion against the hinge-stop inside of the valve body. Due to the weight and center-of-gravity location of the disc and swing-arm assembly, the valve will return to the closed position should flow become interrupted or reversed. External counterweights mounted on the hinge pin are sometimes used to increase or decrease the reaction time and speed of the disc returning to the closed position. Seating surfaces are typically flat, which means the radial disc positioning onto the seat is not critical, except that it must be flat onto the seat.

Normal diameter: 1/2"~60" (DN15~DN1500).
End connection: BW, Flanged.
Pressure range: 150lbs~2500lbs (PN16~PN420).
Working temperature: -196ºC~+560ºC.
Feature: can be designed with a Damping Cylinder. 

Kaitai Valve Group is headquartered at Shanghai China, occupying over 35 thousands square meters. The registration capital of the whole Group comes to RMB 11321 Millions. With an experience of about 30 years in manufacturing all kinds of valves, Kaitai specializes in designing, making and marketing valves for all industries. Its products range from Ball, Butterfly, Gate, Globe, Check, Plug valves to Marine valves and other valves; nominal size from 1/2" to 48"(DN 15 to DN 1200) nominal pressure form 150 Lb to 2500Lb(PN1.0Mpa to PN42.0Mpa); materials cover WCB.. WCC. WC6. WC9, CF8, CF3, CF3M,LCB,LCC. SS304,SS316,SS304L,SS316L, F11, F22, LF2, F51, etc.The products are widely used in the fields of petroleum, chemical metallurgy, power, fuel gas, city pipeline networks and so on. Certificated with ISO9001. API6D.CE/PED and etc.. Kaitai has developed excellent quality control and management system.
Kaitai has a series of modern machines and equipment such as vertical lathes, drill press, milling lathe, grinding machine, other general machine tools and physical & chemical analysis & experiment devices. Also it has developed a well-trained and dedicated team including engineers, technicians and other employees. This allows us to offer customers quality products, competitive prices and prompt deliveries. We always work hard to improve our existing products and pursue new ideas and ways to stay ahead of the ever changing market.

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