Dual Plate Check Valve

Introduction

A Dual Plate Check Valve is a compact and lightweight non-return valve designed to allow fluid flow in one direction while preventing backflow. The Dual Plate design refers to its slim and space-saving profile, which fits between two flanges in a pipeline.

This valve typically features a dual-plate or single-disc mechanism, hinged at the center, which opens when forward flow occurs and closes automatically when flow reverses. Made from robust materials such as carbon steel, stainless steel, or alloys, Dual Plate check valves are versatile and efficient for various applications.

Applications

Dual Plate Check Valve is trusted across various industries for its precision, durability, and reliability. Explore its wide-ranging applications below:

Oil & Gas

Installed in pipelines for crude oil, natural gas, and refined product transport. Prevents reverse flow in compressor stations, separators, and processing systems.

Water Treatment

Prevent backflow in water distribution, sewage, and treatment systems. Commonly used in pump discharge lines to protect equipment.

Power Generation

Used in feedwater, condensate, and cooling systems in thermal and nuclear power plants. Prevents backflow and protects turbines, boilers, and heat exchangers.

Chemical & Petrochemical Plants

Suitable for handling a variety of chemicals and gases in low to medium-pressure pipelines. Prevents contamination and protects sensitive equipment.

Pulp and Paper Industry

Installed in high-pressure steam lines and process fluid pipelines to prevent backflow and maintain process efficiency. Ensures the longevity of pumps and other critical equipment.

HVAC Systems

Used in chilled water and condenser systems to ensure unidirectional flow. Helps maintain system efficiency and prevents damage to pumps and other components.

Fire Protection Systems

Installed in sprinkler systems to prevent water from flowing back into the main supply. Enhances safety by ensuring the system is always ready for operation.

Dimensional Details

Applicable Standards

STEEL CHECK VALVES, API 194/API 6D
STEEL CHECK VALVES, ISO14313
STEEL VALVES, ASME B16.34
FACE TO FACE, ASME B16.10
END FLANGES, ASME B16.5
INSPECTION AND TEST API 598/API 6D

Design Description

ONE PIECE BODY
BUTTERFLY SWING TYPE
DUAL PLATE DISC, LONG-PATTERN
RENEWABLE SPLIT DISC
HORIZONTAL OR VERTICAL SERVICE
WAFER ENDS
AVAILABLE WITH FLANGED ENDS

Materials of Parts

No	Part Name	ASTM Material
No	Part Name	Carbon Steel		Alloy Steel	Stainless Steel
1	Body	A216-WCB	A352-LCB	A217-WC6	A315-CF8
2	Plate	WCB+Cr13	A352-LCB	WC6+HF	CF8
3	Stop Pin	A276-420	A276-420	A276-304	A276-316
4	Back Spring	A313-304	A313-304	A313-304	A313-316
5	Hinge Pin	A276-420	A276-420	A276-304	A276-316
6	Eyebolt	Carbon Steel

NOTE : NPS 8” & larger.

Dimensions Data ANSI Class 150Lb

NPS	2	2^1/2	3	4	6	8	10	12	14	16	18	20	24	in
DN	50	65	80	100	150	200	250	300	350	400	450	500	600	mm
L	2.38	2.62	2.88	2.88	3.88	5.00	2.75	7.12	7.25	7.50	8.00	8.62	8.75	in
L	60	67	73	73	98	127	146	181	184	191	203	219	222	mm
D	4.00	4.88	5.38	6.75	8.62	10.88	13.25	16.00	17.62	20.12	21.50	23.75	28.12	in
D	103	122	135	173	220	277	337	407	448	512	547	604	715	mm
d	2.00	2.50	3.25	4.00	6.00	8.00	10.00	12.00	13.75	15.75	17.75	19.75	23.62	in
d	51	65	80	102	152	203	254	305	350	400	450	500	600	mm
D₁	2.25	2.88	3.50	4.25	6.25	8.25	10.50	12.12	14.00	16.00	18.00	19.88	23.75	in
D₁	56	73	88	108	160	210	266	310	355	405	455	505	605	mm
WT	2	3	4	6	13	25	39	54	80	117	138	163	331	kg

Dimensions Data ANSI Class 300Lb

NPS	2	2 1/2	3	4	6	8	10	12	14	16	18	20	24	in
DN	50	65	80	100	150	200	250	300	350	400	450	500	600	mm
L	2.38	2.62	2.88	2.88	3.88	5.00	5.75	7.12	8.75	9.12	10.38	11.50	12.50	in
L	60	67	73	73	98	127	146	181	222	232	264	292	318	mm
D	4.25	5.00	5.75	7.00	9.88	12.00	14.12	16.50	19.00	21.12	23.38	25.62	30.38	in
D	110	128	147	179	249	305	359	420	483	537	594	652	772	mm
d	2.00	2.50	3.00	4.00	6.00	8.00	10.00	12.00	14.00	16.00	18.00	20.00	24.00	in
d	51	65	80	102	152	200	254	305	350	400	450	500	600	mm
D₁	2.25	2.88	3.50	4.25	6.38	8.27	10.50	12.25	14.00	16.00	18.00	20.00	24.00	in
D₁	58	73	88	108	160	210	266	310	355	405	455	505	605	mm
WT	3	4	6	8	18	31	51	77	117	190	200	265	410	kg

Dimensions Data ANSI Class 600Lb, ANSI Class 900Lb

NPS	DN	L		D		d		D₁		WT	L		D		d		D₁		WT
2	50	2.38	60	4.38	110	2.00	51	2.25	58	4	2.75	70	5.50	140	2.00	51	2.25	58	8
2½	65	2.62	67	5.00	128	2.50	65	2.88	73	5	3.25	83	6.38	162	2.50	65	2.88	73	11
3	80	2.88	73	5.75	147	3.00	80	3.50	88	8	3.25	83	6.50	165	3.00	80	3.50	88	14
4	100	3.12	79	7.50	191	4.00	102	4.25	108	11	4.00	102	8.00	204	4.00	102	4.25	108	20
6	150	5.38	137	10.38	264	6.00	152	6.38	162	26	6.25	159	11.25	286	6.00	152	6.38	162	42
8	200	6.50	165	12.50	318	7.88	200	8.38	212	55	8.12	206	14.00	356	7.88	200	8.38	212	84
10	250	8.38	213	15.62	398	9.88	250	10.50	266	95	9.50	241	17.00	432	9.88	250	10.50	266	145
12	300	9.00	229	17.88	455	12.00	305	12.25	312	140	11.50	292	19.50	495	12.00	305	12.25	312	220
14	350	10.75	273	19.25	490	13.25	337	14.00	355	223	--	--	--	--	--	--	--	--
16	400	12.00	305	22.12	562	15.25	387	15.75	400	360	--	--	--	--	--	--	--	--
in	mm	in	mm	in	mm	in	mm	in	mm	kg	in	mm	in	mm	in	mm	in	mm	kg

NOTE : NPS 8” & larger.

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