Question 1

Forged Steel Check Valve — Design Configurations

Accepted Answer

The SHIELD Forged Steel Check Valve Series CFT/CFS is a comprehensive range of compact, high-integrity non-return valves designed for refinery, pipeline, and general industrial applications. Each valve is manufactured from forged steel for superior strength and is available in swing, lift, and ball configurations.

Question 2

Swing Check Valve

Accepted Answer

The disk swings away from the valve-seat to allow flow in the forward direction, and returns to the valve-seat when upstream flow is stopped, to prevent backflow.

Question 3

Lift Check Valve

Accepted Answer

In Piston, or lift, check valves a body-guided disc moves within the body bore. The body guide ensures alignment of the seat and disc when the valve closes.

Question 4

Ball Check Valve

Accepted Answer

The ball is free to rotate, resulting in even wear and a wiping action between the ball and seat. This feature makes ball checks useful for viscous media.

Question 5

Bonnet Types

Accepted Answer

The bonnet and body are connected by bolts, with a male-female joint and spiral wound gasket made of F316L/graphite. Ring joint gaskets are also available on request. The body and bonnet are all welded and sealed with a threaded and seal welded joint. On request, a full penetration strength welded joint is available. These valves shall be bolted bonnet or welded bonnet type with full or standard bore options.

Question 6

Specifications — Forged Steel Check Valve

Accepted Answer

Size Range: 1/2" - 2" (DN15 - DN50); Pressure Rating: 800LB / 1500LB / 2500LB; Body Materials: Forged Carbon Steel (A105), Forged Stainless Steel (F304, F316, F316L); Disc Materials: Forged Steel; Stem Materials: Stainless Steel 304 / 316; Seat Materials: Integral Weld Overlay; Temperature Range: -29°C to 425°C; Shutoff Rating: Bidirectional Bubble-tight; Design Standard: API 602, ASME B16.34; End Connections: SW, NPT, Flanged; Testing Standard: API 598; Body Style: T-Pattern, Y-Pattern; Operation: Automatic (Non-return); Applications: Refinery, Pipeline, Steam, Chemical