Forged Steel Check Valve-Shield Valves & Control Ltd.

Forged Steel Check Valve

Metal Seated

Size Range

1/4" - 2" (8 - 50mm)

Temperature Range

-321°F to 1100°F (-196°C to 593°C)

Pressure Ratings

Max. ASME Class 4500

Port Type

Full port, Standard port

End Type

Socket Welded, Threaded, Flanged, Butt Welded

Design

Shield^TMForged Steel Check valves are compact, sturdy and ideal for high pressure and high temperature applications. The Forged Steel check valves are available in three bonnet designs.

Bolted Bonnet whose bonnet and body are connected by bolt, with male-female joint, spiral wound gasket, made in F316L/graphite. Ring joint gasket are also available on request.
Welded bonnet which with the body and bonnet all welded and sealed with a threaded and seal welded joint. On request a full penetration strength welded joint is available.
Pressure seal bonnet. These valves shall be bolted bonnet or welded bonnet type with full or standard bore options.

Bolted Bonnet

Welded Bonnet

Pressure Seal Bonnet

Features and Benefits

The forged steel check valves are also available in three different design configurations. These are forged piston check valve, also called lift check valve (spring loaded check valve ), forged ball check valve and forged swing check valve. Forged cryogenic check valves which serves for temperatures down to -321°F (-196°C) are available as well.

Lift Check Valve

Swing Check Valve

Ball CheckValve

Piston check valve, like all check valves, are used to prevent back flow in the line. As an option the designs can include a spring to assist closing and for use in 90-degree styles installed in vertical lines. The pressure of the fluid passing through a system opens the valve, while any reversal of flow will close the valve. In Piston, or lift, check valves a body-guided disc moves within the body bore. The body guide ensures alignment of the seat and dics when the valve closes.
Swing check valves, like all check valves, are used to prevent back flow in the line. The pressure of the fluid passing through a system opens the valve, while any reversal of flow will close the valve. The swing check valve functions by allowing flow forces to move the closure element, it is a hinged clapper which swings or rotates around a supporting shaft. 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.
The function of ball check valves is similar to the piston check, but the ball check valves use a “ball” inside the body to control the movement of flow. 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.


			1. BODY
			Forged steel and is available in both the full or standard port design. It is also available in either T-Pattern or Y-Pattern configurations.
			2. PISTON, BALL OR DISC
			The piston, ball or disc is forged steel and is part of the valve trim. The seating surface of the piston and ball check is of the tapered or plug type design. The seating surface of the swing check is of the flat seat design.
			3. Cover The cover is forged steel and designed to the basic dimensional requirements of the applicable specifications.
			4. COVER BOLTING The cover bolting is manufactured of alloy steel in accordance with the requirements of the applicable specifications.
			5. SPRING
			The spring is optional and supplied only upon request.
			6. SEAT The body seat for the piston and ball check valves is an integral weld overlay and is part of the valve trim. The swing check valve is supplied with a separate seat ring which is pressed into the valve body and wedged into place, forming a seal with the body.