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Hydraulically Operated Safety Valves

The Figure 6139 Hydraulically Operated Safety Valve has been designed as a rapid action, internal safety valve to facilitate the emergency shut-down of tanks and vessels used for the storage and transportation of LPG, Ammonia, Vinyl Chloride and other hazardous liquids stored at high pressure and usually at ambient temperatures. The valve will “FAIL-SAFE” under all conditions
Hydraulically Operated Safety Valves
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INSTALLATION
 
Valves are normally installed in the vessel shell at the inlet/outlet ports or supplied complete with line housings (Figure 6060 / 6085) for fitting into pipelines. They can be installed horizontally or vertically. Note : These valves are NOT intended as primary closure or check valves - despite their tight seating.
 
OPERATION
 
The valve is normally held closed by a heavy duty stainless steel spring and hydraulic pressure is applied to hold the valve open. When the hydraulic pressure is released, the valve closes rapidly to ensure safe shut-down in the event of an emergency.

Hydraulic pressure can be released by :
* Fusible Plugs : Fitted into the hydraulic line and which melt at 740 C (1650 F)
* Frangible Elements : Which can be broken off in an emergency.
* Quick Manual Release : a feature on the Hydraulic Operator (Figure 7020)
* Solenoid Operated : suitable for automatic operation when incorporated into a system for remote operation.
 
OPTIONS
Special Trim (seals and springs) available for service down to -450 C
 
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HYDRAULIC OPERATING PRESSURES
 
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DIMENSIONS AND MATERIALS
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SPECIFICATIONS
• Sizes : 2” (50 mm) 3” (80 mm) 4” (100 mm) 6” (150 mm)
• Flange : ASA 300 RF (Raised Face)
• Max. Working : 21.0 kg/cm2 (2” size)
• Pressure 21.0 kg/cm2 (3” size) 17.0 kg/cm2 (4” size) 17.5 kg/cm2 (6” size)
• Piston Displacement : 0.08 Litres (2” size)
(in air free system) 0.08 Litres (3” size) 0.13 Litres (4” size) 0.29 Litres (6” size)
MATERIALS OF CONSTRUCTION
• Body : Cast Steel
• Cylinder : Steel (Chromed internally)
• Piston : Steel (Chromed externally)
• Seals : Synthetic rubber (to suit service)
• Piston Seal Ring : P.T.F.E.
 
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