Name: Gun Metal Vertical Lift Check Valve – Screwed Ends
Brand: Supreme Valves India
SKU: gun-metal-vertical-lift-check-valve
Rating: 4.8 (47 reviews)

Question 1

What is a check valve and why is it essential for pump protection in the Middle East?

Accepted Answer

A check valve (non-return valve) automatically prevents reverse flow when the upstream pressure drops below downstream pressure. This protects pumps, compressors, and other equipment from damage caused by backflow, water hammer, and reverse rotation. In Saudi Arabian oil fields and UAE industrial plants, check valves are critical for protecting centrifugal pumps in seawater cooling systems, fire protection pumps, and pipeline booster stations. API 594 and API 6D specify the design and testing requirements for check valves used in oil and gas service.

Question 2

What are the different types of check valves and their applications?

Accepted Answer

Swing check valves feature a hinged disc that swings open with forward flow and closes by gravity when flow stops. They are used in horizontal pipelines with low velocity flow. Spring-loaded check valves (silent check valves) use a spring to close rapidly, preventing water hammer in high-rise buildings and pump discharge lines. For horizontal and vertical installation, consider spring-loaded wafer check valves. For UAE desalination plants and Saudi Arabian seawater intake systems, swing check valves with NAB (Nickel Aluminium Bronze) bodies are commonly specified for their anti-biofouling properties.

Question 3

What is water hammer and how do check valves prevent it?

Accepted Answer

Water hammer occurs when a sudden stop in fluid flow causes a pressure surge that can damage pipes, valves, and equipment. This commonly happens when a pump shuts down and the check valve closes too slowly, allowing the fluid column to reverse and strike the valve disc. To prevent water hammer, use spring-loaded check valves (silent check) that close rapidly before flow reversal occurs. For critical Saudi Arabian water injection pipelines, a pre-closed check valve (with spring assist) is recommended. Proper sizing using the API 12F method and avoiding installation near elbows helps minimize water hammer effects.

Question 4

What materials are recommended for check valves in seawater service?

Accepted Answer

For seawater cooling systems in GCC countries, Nickel Aluminium Bronze (NAB/C95800) is the preferred body material due to its excellent corrosion resistance, high strength, and natural anti-biofouling properties. For high-chloride environments (>50,000 ppm Cl-), 254 SMO (UNS S31254) or Super Duplex (2507/PREN >40) provides superior pitting resistance. Cast Steel (WCB) with internal components in SS316 is suitable for general oil and gas service. For fire protection systems in Dubai and Saudi Arabia, UL Listed and FM Approved swing check valves in ductile iron or bronze are typically specified.

Question 5

What are the API 594 testing requirements for check valves?

Accepted Answer

API 594 covers wafer, lug, and double-flange check valves and requires hydrostatic shell testing at 1.5 times the rated pressure, with seat testing at 1.1 times rated pressure. For Saudi ARAMCO projects, check valves must comply with API 594 and demonstrate compliance with API 598 leak testing. We provide EN 10204 3.1 material certificates, ASME B16.34 compliance documentation, and complete test reports including shell strength, seat tightness, and disc closure time. Our API 594 check valves are suitable for Class 150 through Class 600 ratings in sizes 2 inches to 60 inches.

Question 6

How should check valves be installed for optimum performance?

Accepted Answer

Check valves must be installed with the flow direction arrow matching the pipeline flow. Swing check valves should be mounted horizontally unless specifically rated for vertical installation with upward flow. For horizontal installation, the hinge pin must be at the top to ensure the disc closes by gravity. Install at least 5 pipe diameters downstream of pumps or flow disturbances. Avoid mounting near elbows or reducers that cause uneven flow distribution. For pump discharge applications in Saudi Arabian water treatment plants, install with a resilient seated valve between the pump and check valve to prevent disc hammering.

Question 7

What maintenance is required for check valves in industrial applications?

Accepted Answer

Check valves are passive devices requiring minimal maintenance, but regular inspection extends service life. Annual inspection should verify the disc moves freely, seats properly, and the hinge pin shows no signs of corrosion or wear. For spring-loaded check valves, confirm the spring tension is within specifications. In seawater service common to Gulf industrial plants, inspect for calcareous deposits and marine growth on internal components. Replace worn seats, damaged discs, and corroded springs promptly to prevent failure. For critical fire protection systems in UAE high-rise buildings, NFPA 25 requires annual inspection and testing.

Component	Material Specification
Body & Bonnet	Bronze (IS 318 Gr. LTB 2) / Forged Brass
Stem / Spindle	Forged Brass / Bronze
Seat / Trim	Integral / Bronze / PTFE

Parameter	Specification / Standard
Manufacturing / Design Standard	IS 554 / BS 21 / ISO 7 / IS 778
Testing Standard	API 598 / EN 12266-1
Pressure Rating	PN16 / PN20 / Class 150

S.N.	Parts Name	Material	Qty
01	BODY	ASTM A 216 Gr. WCB	1
02	SEAT RING	AISI 410 (13% CR. )	1
03	DISC	AISI 410 (13% CR. )	1
04	COVER	ASTM A 216 Gr. WCB	1
05	COVER STUD & NUT	ASTM A 193 Gr. B7 / ASTM A 194 Gr. 2H	1
06	GASKET	COMPRESSED ASBESTOS FIBRE / SPIRAL WOUND METALLIC GASKET	1
07	SPRING	M.S.	1

Size	Inch	M.M.	A	B	ØC	ØD	H	ØM	RF	N	PCD
1"	1"	25	160	18	68	115	88	14	2.0	4	85
1.1/2"	1.1/2"	40	200	18	88	150	105	18	3.0	4	110
2"	2"	50	230	20	102	165	118	18	3.0	4	125
2.1/2"	2.1/2"	65	290	22	122	185	128	18	3.0	8	145
3"	3"	80	310	24	138	200	140	18	3.0	8	160
4"	4"	100	350	24	162	235	158	22	3.0	8	190
5"	5"	125	400	26	188	270	175	26	3.0	8	220
6"	6"	150	480	28	218	300	195	26	3.0	8	250
8"	8"	200	600	34	285	375	243	30	3.0	12	320
10"	10"	250	730	38	345	450	334	33	3.0	12	385

Gun Metal Vertical Lift Check Valve – Screwed Ends

Key Applications

Materials of Construction (MOC)

Technical Specifications

Material of Construction

Testing Details & Standards

Dimension Tables