API 594 Check Valve

The main purpose of the dual plate wafer check valve is to perform the work of almost any conventional valve. However, being smaller makes it lighter and, therefore, is more cost efficient to purchase, install and maintain. It is also a silent check valve; because of it’s innovative design, it does not slam upon closing.
The dual plate wafer check valve plate design and flat seat offer many advantages. The flat seat eliminates any possibility of board snaps in the seat, which snaps occur frequently in other valves. When suspended in a vertical pin, the two plates have a reduced weight which eliminates excessive wear on the plate lugs. This wear can cause the plate to collapse on the seat’s open surface, causing the valve to subsequently fail

QDV Check Valves are available in varied materials like Forged Carbon Steel conforming to A105; Forged Alloy Steel like LF2, F11, F22, and Forged Stainless Steel like F304, F304L, F316 and F316L. Size range commences from 10NB through 50NB and pressure rating up to ANSI 800#.

QDV Forge valves are available in two bonnet designs. The first design is the Bolted Bonnet, with male-female joint, spiral wound gasket, made in F316L/graphite. Ring joint gasket are also available on request. The second design is the welded bonnet, with a threaded and seal welded joint. On request a full penetration strength welded joint is available.

The check valves are also available in three different design configurations. These are piston check, ball check, or swing check designs.

Features

1.  Forged steel check valves conform to ASME B16. 34
2.  Each tested according to API 589, and marking is per MSS SP-25
3. Three bonnet designs A) Bolted B) Welded C) Pressure seal
4. Three different design configurations A) Piston check B) Ball check C) Swing check
5. Investment casting
6. Working pressure: 200 PSI WOG
7. Temperature range: -20 - 232°C
8. Materials: WCB, SS 316 and SS 304

Standard

• Normal Size: 1/2”~2”
• Pressure rating: 150 LB~2500 LB
• Design Standard: API 6D
• Design Features: Piston or Swing type, BB, WB, PSB.
• Materials: A105, LF2, F11, F22, F5, F304, F316, F304L, F316L, F51
• Test Standard: API 6D, API 598