API594 Check valve

Dual Plate Check Valve

Product Description

XDV wafer Dual Plate Check Valves designed and manufactured strictly to International Standards APl6D, APl594, ASME B16.34 or Equivalent.

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Product Range&Features

Size	2"~48"
Rating	150LB~2500LB
Body Materials	Carbon Steel, Stainless Steel, Alloy Steel, Duplex S.S. XDSS, etc.
Design Standards	API 594/ASME B16.34
Trim	per API 594
Face to Face Standards	ASME B16.10
Flange Dimension Standards	ASME B 16.5
Pressure Test Standards	API598
Quality/Product Certifications	ISO9001, ISO14001, ISO18001
Fugitive Emissions	ISO 15848-1, API 622
NACE	NACE MR 0103 NACE MR 0175
Shutoff Class	API 598 (Zero Leakage), API 6D
End Connection	Wafer Lug

Product Details

NO.	PAPT NAME	MATERIAL-ASTM
1	BODY	ASTM A216 WCB 13CR
2	DISC	ASTM A216 WCB 13CR
3	SPRING	INCONEL X750
4	SHAFT	ASTM A276 410
5	PIN	ASTM A276 410
6	PIN SEAT	ASTM A276 410
7	BAFFLE	ASTM A276 410
8	SCREW	ASTM A276 410
9	SCREW RING	C.S.
10	BEARING	SS304
11	BEARING	SS304
12	NAMEPLATE	SS304
13	RIVER	SS304

Visual valve inspection

1. Before installation, check the valve name plate and valve body information to ensure the valve is suitable for the intended service.

2. Before installation, remove the flange cover and the protective film on the flange sealing face, and disc support, inspect the bore and the flange sealing surface, remove any dirt with clean soft cloth, use an anti-corrosive cleaning liquid to clean if necessary, and never use any other chemical products.

3. Inspect the flange gasket (including ring gasket) sealing surface and ensure it is in acceptable condition for installation.

Valve installation

Position the valve into the pipe or the flange connection; ensure that any stress caused by improper pipe alignment is relieved first. Valves are not intended to be a means of aligning improperly fitted pipe.
Valves marked with flow direction must be installed in line with the piping flow.
In horizontal flow installation, the hinge pin must be vertical.
In liquid service we recommend valve be installed at least five pipe diameters downstream from a pump discharge and/or other pipe fittings for maximum service life.
Dual plate check valves are not piggable.
To maximize the life of check valve, it should be installed a sufficient distance from turbulence source to ensure the valve is in fully developed flow.

Troubleshooting guide

PROBLEM	PROBABLE CAUSE	SOLUTION
Leakage between disc and seat	Dirt on the sealing surface	Clean the sealing surface
	Sealing surfaces damaged by abrasion and erosion	Re-overlaying and machining sealing surfaces till meet requirement
	Disc distorted caused by loading force due to too quick closing speed	Replacing with new disc
Valve is without function of controlling back-flow of medium	Reverse direction of installation	Install valve again to keep consistent with flow direction
Opening and closing not easily	Distortion of pin axis due to wearing and tearing	Replacing pin
Opening and closing not easily	Rust erosion of pin axis	Take it out, repair the surface and put on lubricant grease before assembly