Question 1

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

Accepted Answer

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 When fully open, the gate is completely withdrawn from the flow path, providing minimal pressure drop and maximum flow capacity.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

Question 2

What are API 600 gate valve pressure/temperature ratings?

Accepted Answer

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.

Question 3

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

Accepted Answer

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.

Question 4

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

Accepted Answer

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.

Valve Type	Gate Valve, Union Bonnet, Handwheel Operated
Nominal Size	1/2 inch (15mm) to 2 inch (50mm) NPT
Pressure Class	Class 200 LB (PN130) threaded
End Connection	Threaded Female NPT, ASME B1.20.1
Body Material	Gunmetal / Bronze alloy, cast
Bonnet Material	Gunmetal / Bronze alloy, cast
Disc / Wedge	Bronze alloy, integral or renewable seat
Seat	Bronze alloy, integral or renewable
Stem	Stainless Steel AISI 316 or bronze alloy
Packing	Graphite / PTFE braided rings
Handwheel	Cast iron or aluminium, epoxy coated
Design Standard	API 602 / MSS SP-80 / BS 5154
Testing Standard	API 598 / BS 6755 Part 1
Shell Test Pressure	1.5 x rated pressure minimum
Seat Test Pressure	1.1 x rated pressure minimum
Leak Test	Zero leakage, bubble-tight closure
Marking	MSS SP-25
Coating	Natural finish or epoxy coating as required

Valve Type	Gate Valve, Handwheel Operated, Rising Stem
Nominal Size	1 inch (25mm) to 4 inch (100mm)
Pressure Class	Class 150# (PN16/PN20)
End Connection	Raised Face (RF) Flanged, ASME B16.5 / EN 1092-1
Flange Finish	FF (Flat Face)
Body Material	BS 1400 AB2-C Aluminium Bronze (equivalent ASTM B148 C95800 / C95500)
Bonnet Material	BS 1400 AB2-C Aluminium Bronze
Wedge Plug	BS 1400 AB2-C Aluminium Bronze, integral
Seats	BS 1400 AB2-C Aluminium Bronze, integral
Stem	BS 1400 AB2-C Aluminium Bronze or SS316, rising type with integral backseat
Backseat	BS 1400 AB2-C Aluminium Bronze, integral
Bushing / Gland	BS 1400 AB2-C Aluminium Bronze
Ring Insert Seal	AB2-C ring insert seal, flat ring 11E11 type
Packing	Braided rings ARA 6 type, graphite / PTFE based
Handwheel	Cast iron / ductile iron, epoxy coated
Design Standard	API 600 / BS 5154 / EN 12516
Testing Standard	API 598 / BS 6755 Part 1
Shell Test Pressure	1.5 x rated pressure minimum
Seat Test Pressure	1.1 x rated pressure minimum
Leak Test	Zero leakage, bubble-tight closure
Material Certs	EN 10204 3.1 for all pressure-retaining parts
PED	Declaration of Conformity per PED 2014/68/EU
Marking	MSS SP-25
Coating	Natural finish or epoxy coating as required

Parameter	Value
Size Range	1/2" to 24"
Pressure Rating	150# to 2500#

Size Range	1/2" to 48" (DN15 to DN1200)
Pressure Rating	Class 150 to 2500 (PN10 to PN420)
Body Materials	WCB, CF8M, CF3M, Duplex SS, NAB
Trim Materials	SS304, SS316, SS316L, Stellite, Inconel
End Connections	Flanged RF/FF/RTJ, Threaded, SW, BW
Standards	API 600/602/603/608/609, ASME B16.34, BS 1873
Temperature Range	-196°C to +550°C
Face to Face	ASME B16.10, EN 558, API 609

Elleffe Srl Vs252a01 Gate Valve Union Bonnet

Detailed Specifications

Gate Valve -- Item 1 (VS252A01 NPT)

Gate Valve -- Item 2 (VS 151 AG 6X1 Flanged AB2-C)

Technical Specifications

Materials of Construction

Carbon Steel

Stainless Steel

Alloy Steel

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Feature 2

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