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Parallel Gate Valve
Forged-parallel-gate-valve

Parallel Gate Valve

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Flowsar parallel slide gate valves are designed with positional seal, using the line pressure as a sealing force. The compressed spring between the two closure members provides an initial seal during low pressure conditions. The increasing line pressure will push the closure members with higher forces against each other which creates the primary seal. The higher the medium pressure, the better the sealing performance. Therefore this valve type is widely used in high pressure and high temperature services such as steam and feedwater.

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Description

Flowsar parallel slide gate valves are designed with positional seal, using the line pressure as a sealing force. The compressed spring between the two closure members provides an initial seal during low pressure conditions. The increasing line pressure will push the closure members with higher forces against each other which creates the primary seal. The higher the medium pressure, the better the sealing performance. Therefore this valve type is widely used in high pressure and high temperature services such as steam and feedwater.

CHARACTERISTICS SPECIFICATIONS
Size 2” up to 88“ (DN 50 up to DN 2200)
Pressure Rating ASME 150# to 2500#
Body Material Carbon Steels, Low Temperature Carbon Steel, Martensitic Steels, Austenitic Stainless Steel, Duplex Stainless Steels,
Super Duplex Stainless Steels, Nickel Alloys, Nickel Aluminum Bronze, Hastelloy, Inconel,
Titanium Alloy & Carbon Steel with Internal Corrosion Resistant Alloy (CRA) Overlay

Additional information

Design Standard

API 602, API 600, MESC SPE 77 / 101, MESC SPE 77 / 102, ASME B16.34
Pressure / Temperature Rating

ASME B 16.34
Test (Inspection) Standard

API 598, API 6D, MESC SPE 77/101, 77/ 102, ISO 5208, API6FA, ISO 10497, ISO 15848 – 1&2, Bs6364
Construction Details

Bolted Bonnet / Pressure Seal Bonnet, OS & Y Type Rising Stem
End connection

Screwed, Socket Weld, Flanged, Hub End, Butt-Weld
Operator / Actuator

Lever, Gear, Actuator (Pneumatic, Hydraulic, Electro-Hydraulic and Electric Motorised)

Gate Valves are available in six different types :

Wedge type Bolted Bonnet
Wedge type pressure seal bonnet
Parallel Slide Bolted Bonnet
Parallel Slide Pressure Seal Bonnet
Conduit Bolted Bonnet Slab Gate
Conduit Bolted Bonnet Expanding Gate

Gate Valves can be designed in a special version suitable for cryogenic service. In this case, all the materials and technical features are designed to withstand minimum design temperature required by the Customer, down to Cryogenic -196°C. If required by the customer, specific Cryogenic Tests are performed to verify the behaviour of production valves in terms of valve torque, sealing capability, emissions vs the ambient.

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