Low Temperature Quick Open Emergency Shut-off Valve

Low Temperature Emergency Shut-off Valve Is Specifically Designed ForLNG Gasification StationThe Safety Valve Belongs To The Category Of Low-temperature Valves, Produced By Manufacturers Such As Weidun VTON And Shanghai Evers, And Developed In Combination With Japanese Technology And The Actual Needs Of Chinese LNG Gasification StationsThis Valve Is Mainly Used ForLiquefied Natural GasTheLiquid OxygenTheLiquid NitrogenTransportation System For Low-temperature Media, Applied To LNG Tanks, Tankers, AndLow Temperature Storage TankWait For The Scene And Execute The Emergency Cut-off Protection Function.

This Product Adopts Cast Stainless Steel Valve Body, CF8/CF8M Material Valve Body And Stainless Steel Valve Stem, And Uses Sealing RingsPTFEOrPCTFEMaterial, Nominal Diameter DN25-DN100, Suitable For Temperatures Ranging From -196 ℃ To+75 ℃. The Opening And Closing Control Is Achieved Through The Compression Spring Of The Cylinder Piston. When The Ambient Temperature Reaches 70-75 ℃, The Melting Plug Automatically Melts And Triggers The Closure. At The Same Time, A Manual Operation Device Is EquippedThe Structure Includes A Dual Sealing System, Fire And Explosion Prevention Design, And Buffering Function. Installation Requires Strict Degreasing Treatment And Avoids Welding Damage To The Sealing Surface

It Plays An Irreplaceable And Important Role In The Safety Of LNG Gasification Stations, Ensuring The Normal Operation Of Various LNG Gasification Stations And Effectively Avoiding Major Safety Accidents Caused By Gas Leakage, Deflation, And Other Reasons.

Product Technical Parameters

Product Name: Low Temperature Pneumatic Emergency Shut-off Valve

Product Specification: Nominal Diameter: DN25~DN100

Applicable Media: Liquid Nitrogen, Liquid Oxygen, Liquid Argon, Liquefied Natural Gas, Liquid Ethylene, Etc. (LNG, LO2, LN2, LAAr)

Material: Valve Body, Handwheel: Cast Stainless SteelCylinderBracket: Cast Aluminum Valve Stem: Stainless Steel

Other: Welding Form: Plug Welding, Can Also Be Welded By Adding Pipes To Form Butt Welding

Caution: Avoid Oil

According To Relevant National Standards, Emergency Shut-off Valves Must Be Installed At LNG Output Ports To Ensure The Safe Operation Of LNG Tanks And Tankers, And To Cut Off Hazardous Sources In Case Of Accidents To Reduce Personnel And Property Losses.

Main Component Materials：

External Connection Dimensions Of Low-temperature Emergency Shut-off Valve(mm) (VDJQ-20~50 And VDJQ32B~50B Models)

VDJQ65-100 External Dimensions (mm)

Product Working Principle

When The Cylinder Is Filled With The Specified Pressure, The Piston Rises To Drive The Valve Stem To Open The Valve. When It Is Closed, The Gas Inside The Cylinder Is Released. The Piston, Under The Action Of The Spring, Drives The Valve Stem And Valve Disc To Move Downwards. The Sealing Element Presses The Valve Seat Tightly, And The Valve Closes;

When Operated Pneumatically, When The Ambient Temperature Around The Valve Reaches The Melting Temperature Of The Fusible Metal (for Emergency Shut-off Valves Used In Low-temperature Tank Trucks And Low-temperature Tank Containers, The Fusible Plug Should Melt At 75 ℃± 5 ℃), The Fusible Metal Inside The Plug Will Melt, And The Working Pressure Inside The Cylinder Will Be Automatically Discharged. The Piston, Under The Action Of The Spring, Drives The Valve Stem And Valve Disc To Move Downward, And The Sealing Element Presses The Valve Seat Tightly, Causing The Valve To Close;

Rotate The TopHandwheelDrive The Valve Stem And Disc Upwards To Manually Open The Valve.