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 When fully open, the gate is completely withdrawn from the flow path, providing minimal pressure drop and maximum flow capacity.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

Home / Products / Knife Gate Valves

Knife Gate Valves

Name: Knife Gate Valves Exporter
Brand: Supreme Valves India
SKU: SV-KNIFEGATEVALVE
Rating: 4.8 (127 reviews)

Our knife gate valves are designed to handle tough conditions, including slurries, pulp, and other solids. The sharp gate cuts through the media to provide a tight shutoff in demanding applications.

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Product Specifications

Design Standard	MSS SP-81
Type	Wafer, Lug
Material	Cast Iron, Carbon Steel, Stainless Steel
Operation	Handwheel, Bevel Gear, Pneumatic, Electric
Size Range	2" to 48"

Materials of Construction

Part	Carbon Steel	Alloy Steel	Stainless Steel
Body	A216 WCB/WCC; Ductile Iron	—	A351 CF8/CF8M
Gate	WCB ENP/HCr overlay	—	SS304/SS316; Hardfaced as required
Seat	Metal: 410/316 + HF	—	Resilient liner (EPDM/NBR/PTFE) or SS316 + HF
Stem	A276 TP410	A276 TP410	A276 TP304/316
Packing	Graphite/PTFE packing with follower
Gland Flange	A105	A105	A351 CF8/CF8M
Studs	A193 B7	A193 B16	A193 B8
Nuts	A194 2H	A194 7	A194 8
Gasket	Spiral wound SS316/304/321 with graphite filler

Purchase Options

Add to Cart Request Enquiry WhatsApp Download Datasheet

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

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

Technical Specifications

Design & Exporting

Standard: BS 5351 / API 6D

Testing & Inspection

Standard: API 598 / BS 5146

Pressure Rating

Class: 150# / 300#

Temperature Rating

Max Temp: 180°C - 300°C

Test Pressure Requirements

Test Type	Pressure	Standard
Hydrostatic Body Test	425 PSI (Class 150)	API 598
Seat Test	300 PSI (Class 150)	API 598
Air Test	80 PSI	API 598

Materials of Construction

Part Name	Material Specification
Body	ASTM A351 Gr. CF8/CF8M/CF3/CF3M, ASTM A216 WCB, Cast Iron
Ball/Disc	AISI 304/316/304L/316L Stainless Steel
Stem	AISI 304/316/304L/316L, AISI 410
Seat/Seal	PTFE, Reinforced PTFE, Graphite
Gaskets	Spiral Wound Metallic, PTFE, Graphite
Bolting	ASTM A193 Gr. B7/B8, Carbon Steel

Size Range & End Connections

Size Range:

1/2" to 12" (15mm to 300mm)

End Connections:

Flanged (ANSI B16.5), Screwed (BSP/NPT), Socket Weld (ANSI B16.11), Tri-Clover

Pressure Classes:

Class 150, 300, 600, 800, 1500, 2500

Face to Face:

As per ANSI B16.10, BS 5351

Technical Notes

All dimensions are in millimeters unless otherwise specified
Tolerance: ±3mm for standard dimensions
Complete material traceability provided with mill certificates
Valves tested as per API 598 and customer specifications
Special materials, coatings, and certifications available on request
Gear operators and actuators available for larger sizes
Fire-safe and anti-static designs available on request

Standards Compliance

API 6D

Pipeline Valves

API 598

Valve Testing

BS 5351

Steel Ball Valves

ANSI B16.34

Valve Design

ISO 9001

Quality Management

IBR

Indian Boiler Regulations