What is a gate valve and when should it be used?

A gate valve uses a flat or wedge-shaped gate that moves perpendicular to the flow direction to open or close. When fully open, the gate is completely withdrawn from the flow path, providing minimal pressure drop and maximum flow capacity. Gate valves are designed for on-off service only and should never be used for throttling. They are ideal for pipelines requiring full bore flow with minimal turbulence, such as crude oil transmission lines, refined product pipelines, and raw water intake systems in Saudi Arabian oil fields and UAE desalination plants.

What are API 600 gate valve pressure/temperature ratings?

Supreme Valves API 600 gate valves are available in Class 150, Class 300, Class 600, and Class 900 ratings for sizes from 2 inches to 48 inches. The Class 150 and 300 cast steel valves (WCB) are most common for general oil and gas service. For high-pressure Saudi Arabian gas pipelines and steam distribution systems, Class 600 forged steel valves (A105, F22) are specified. API 602 compact steel gate valves are available for smaller sizes up to 4 inches in Class 150-1500 ratings.

What's the difference between WCB and CF8M gate valve materials?

WCB (ASTM A216 Grade WCB) is a carbon steel casting material suitable for general service up to 425°C with good strength and machinability. CF8M (ASTM A351 Grade CF8M) is a stainless steel casting (316 SS) offering superior corrosion resistance, especially against chlorides and sour service. For seawater cooling systems in GCC countries, CF8M or Nickel Aluminium Bronze (NAB) is preferred. WCB with FBE coating is used for buried pipeline service where corrosion protection is provided externally.

How does a flexible wedge gate valve work in high-temperature steam?

A flexible wedge gate valve features a one-piece disc with a split stem connection that allows slight angular movement of the wedge seat faces. This flexibility compensates for thermal expansion and contraction during steam service, maintaining a tight seal throughout temperature cycles. The design prevents binding and ensures reliable shut-off in steam distribution lines up to 260°C. For superheated steam applications above 260°C, solid wedge design with hardfaced seats is recommended.

What is the difference between OS&Y and bolted bonnet gate valves?

OS&Y (Outside Stem and Yoke) gate valves have the stem threads visible outside the bonnet, providing clear visual indication of open/closed position and easy packing replacement without removing the actuator. Bolted bonnet designs have the stem internal to the valve body, offering a more compact profile but requiring disassembly for maintenance. OS&Y is preferred for critical oil and gas service and Saudi Aramco specifications, while bolted bonnet is used for smaller sizes and budget applications.

Can gate valves be used for throttling service?

Gate valves should NOT be used for throttling service. Partially opening a gate valve creates high velocity flow and vibration that can damage the seat faces and cause premature failure. The design provides only two positions: fully open or fully closed. For throttling or modulating control, use globe valves, control valves, or butterfly valves. Using gate valves for throttling voids the warranty and can cause safety issues in high-pressure systems common in Saudi Arabian oil and gas facilities.

What documentation is required for gate valve export to Saudi Arabia (SABER)?

Export of gate valves to Saudi Arabia requires: (1) SASO/SABER Product CoC (Certificate of Conformity) obtained via the SABER portal, (2) Commercial Invoice with HS Code 8481.80, (3) Packing List, (4) Bill of Lading, (5) Manufacturer's Test Reports (API 598 hydrostatic and pneumatic seat testing), (6) Material Test Certificates (EN 10204 3.1) with PMI verification, (7) Certificate of Origin from Indian Chamber of Commerce, (8) ARAMCO Form 4-1514001 for approved source listing. Our export documentation package supports seamless customs clearance for Riyadh, Jeddah, and Dammam ports.

Cast Steel Gate Valves

1077 Cast Steel Gate Valve, Class-150 (Flanged)

Name: 1077 Cast Steel Gate Valve Class-150 Flanged
Brand: Supreme Valves India
SKU: SV-1077CASTSTEELGATEVAL
Rating: 4.8 (127 reviews)

Cast steel gate valve to BS EN ISO 10434 / API 600. Bolted bonnet, outside screw, yoke type, rising stem. Renewable 13% Cr. Stainless Steel (SS 410) working parts. Flanged ends as per ASME B 16.5 Class-150.

Test Pressure (Hydrostatic)

Shell: 31 kg/cm²g (425 psig)
Seat: 21 kg/cm²g (313 psig)
Seat (Steam): 10.55 kg/cm²g (150 psig)
Max Working Temp: 425°C

Suitable For: Steam, Water, Oil

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Salient Features

Materials of Construction (MOC)

Component	Material Specification
Body & Bonnet	Ductile Iron (ASTM A536 / EN-GJS-400-15)
Stem / Spindle	SS 410 / SS 420
Seat / Trim	EPDM / NBR / Bronze

Technical Specifications

Parameter	Specification / Standard
Manufacturing / Design Standard	EN 1171 / AWWA C509 / BS 5163
Testing Standard	API 598 / EN 12266-1
Pressure Rating	PN16 / PN25

Sizes / Dimensions

Size (in)	Size (mm)	A ±1.5	B ~	ØC ~
1 1/2	40	165	330	210
2	50	178	340	210
2 1/2	65	190	395	210
3	80	203	430	225
4	100	229	521	255
5	125	254	568	255
6	150	267	666	356
8	200	292	783	400

~ ±10

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Purchase Options

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Material of Construction

S.N.	Parts Name	Material	Qty
01	Body	CF8/CF8M/C. I./C. S.	1
02	Bonnet	CF8/CF8M/C. I./C. S.	1
03	Wedge	CF8/CF8M/AISI 410 (13%CR)	1
04	Seat Ring	CF8/CF8M/AISI 410 (13%CR)	1
05	Stem	CF8/CF8M/AISI 410 (13%CR)	1
06	Gland	S.S./C. S.	1
07	Yoke Sleeve	Cast Steel/Cast Iron	1
08	Bonnet Bush	SS/AISI 410	1
09	Gasket	Spiral Wound Metallic	1
10	Gland Packing	Graphoil	-
11	Bonnet Stud & Nut	S.S./M.S.	-
12	Eye Bolt & Nut	S.S./M.S.	2
13	Hand Wheel	Cast Iron/S.G. Iron	1

Testing Details & Standards

Class: 150
Hydro Test Pressure Body: 425 PSI
Seat: 300 PSI
Max Temp: 300°C
Air Test: Seat 80 PSI ± PSI

Dimension Tables

Size	A	B	ØC	ØD	ØM	N	PCD
25	127	11.1	51	108	16	4	79.2
40	165	14.2	73	127	16	4	98.5
50	178	15.7	92	152	19	4	120.5
65	190	17.5	105	178	19	4	140
80	203	19	127	190	19	4	152
100	229	24	157	229	19	8	190.5
125	254	24	186	254	22	8	216
150	267	25.4	216	279	22	8	241
200	292	28.4	270	343	22	8	298
250	330	30	324	406	25	12	362
300	356	31.5	381	483	25	12	432