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 When fully open, the gate is completely withdrawn from the flow path, providing minimal pressure drop and maximum flow capacity.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.

Knife Gate Valves

Knife Gate Valve 250mm Class 300 Hydraulic Actuated

Name: Knife Gate Valve 250mm Class 300 Hydraulic Actuated
Brand: Supreme Valves India
SKU: SV-KNIFEGATEVALVE250MMC
Rating: 4.8 (127 reviews)

Industrial knife gate valve for medium-pressure applications. Features hydraulic actuation, CS GR.460 body construction, and SS304 stainless steel internals. Ideal for slurry, pulp, and wastewater applications.

Key Specifications

Size: 250mm (10 inch) NB
Pressure Class: ASME 300 (Class 300)
Actuation: Hydraulic
End Connection: Flanged as per ASME B16.5

Design Standards

Specification: MD-101-SMEM-EG-PI-SPC-0004
Flange Standard: ASME B16.5
Testing: API 598 / BS 6755 Part-I

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Salient Features

Hydraulic actuated for automated control
Class 300 rating for medium-pressure service
SS304 gate disc for corrosion resistance
Knife-edge design cuts through slurries
ASME B16.5 flanged connections
Robust CS GR.460 body construction
Full bore design for minimal pressure drop
Bi-directional sealing capability

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

Test Pressure

Test Type	Pressure (bar)	Pressure (PSI)	Medium
Shell / Body Test (Hydrostatic)	76.5	1110	Water
Seat Test (Hydrostatic)	56	814	Water
Seat Test (Pneumatic)	7	100	Air

Applications

Mining & Mineral Processing
Slurry Handling Systems
Wastewater Treatment
Power Generation
Pulp & Paper Industry
Cement Plants

Frequently Asked Questions

What is the pressure rating of the 250mm Class 300 Knife Gate Valve?

This Knife Gate Valve is rated for ASME Class 300, suitable for applications up to 740 PSI (51 bar) at ambient temperature.

What is the difference between Class 300 and Class 600 Knife Gate Valves?

Class 300 valves have a lower pressure rating (51 bar vs 102 bar) and thinner flanges, making them suitable for medium-pressure applications while Class 600 is for high-pressure service.

Can this valve handle abrasive media?

Yes, the knife-edge gate design and SS304 construction make it ideal for handling abrasive slurries, powders, and fibrous materials common in mining and pulp applications.

Need a Custom Enquiry?

Contact our technical team for pricing and delivery information.

Purchase Options

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Material of Construction

S.N.	Parts Name	Material	Qty
01	Body	WCB/SS 304/316	1
02	Gate	SS 304	1
03	Gland Packing	Imp. Asbestos	1
04	Gland Busher	S.G.I.	1
05	Spindle	SS 304	1
06	York	M.S./S.S.	1
07	Sleeve	G.M.	1
08	Block	CI	1
09	Wheel	SGI	1
10	Fastners	MS	1

Dimension Tables

Size	Inch	M.M.	A	B	C	D	E	F	H	I	PCD
2" 50	2"	50	95	150	60	50	12	50	14	200	121
2.5" 65	2.5"	65	110	170	70	50	12	65	14	200	140
3" 80	3"	80	120	180	80	50	12	75	14	200	153
4" 100	4"	100	155	225	115	56	12	100	18	205	191
5" 125	5"	125	185	245	135	56	15	125	18	205	216
6" 150	6"	150	200	275	160	60	15	150	18	260	243
8" 200	8"	200	260	340	215	70	16	200	18	320	299
10" 250	10"	250	330	406	260	70	16	250	20	320	362
12" 300	12"	300	360	474	310	70	16	300	20	360	432
14" 350	14"	350	440	530	365	75	18	350	22	360	476
16" 400	16"	400	488	590	410	90	18	400	25	450	540