Rotork API Ball Valve, Gas Over Oil API Ball Valve, Shafer Actuated Ball Valve

GALLERY

PRODUCT DESCRIPTION

Gas-Over-Oil Actuated Ball valve

The gas over hydraulic actuator is designed and used for the operation of quarter turn valves (ball valves) installed on gas transportation lines, in compressor stations and everywhere a high pressure gas supply is available.

The gas over oil is composed of one or two double action hydraulic cylinders that, pressurized, determine the linear motion of the piston contained in it. The linear motion of the piston is transformed into rotation by a scotch yoke mechanism.

Gas sampled by the line, pressurizes oil contained in one of the two gas-hydraulic tanks and then the one of the cylinder determining the drive of the actuator.

A peculiar feature of gas over oil actuator is its great flexibility of use obtained by the choice of a manufacturing solution easy, solid and without parts in motion.

FEATURE:

• Actuators operating at different pressures are available upon request.

• Varieties are offered depending on geographical requirements, engineering works and site conditi

• Gas over oil tanks separate the feeding gas from the hydraulic cylinder.

• Canted or symmetric scotch yoke design achieves high break torque for operating all kinds of quarter-turn valves.

• Automatic control groups for the actuator operation (in opening or in closing) are also available. Such as: ON-OFF, Line Break Valve (LBV), Emergency Shut Down (ESD), Electrical Fail Safe (EFS) and Liquid Line Break Valve (LLBV).

TECHNICAL DATA

• Design Pressure : Up to 105 barg

• Supply Medium : Sweet or Sour high pressure gas, Nitrogen or Instrument Air

• Output Torque : Up to 750,000 Nm

• Ambit Temperature (Standard Range) : –29°C to +80°C

• Ambit Temperature (Extend Range) : –60°C to +180°C

Gas over oil bal valve work with line pressure. They work by compressing hydraulic oil with the supply pressure. They perform perfectly on all quarter turn valves. They are the actuator type that is frequently preferred in natural gas pipelines. Gas over oil actuators can be upgraded with emergency shutdown, fail safe and line break features according to customer requirements.

DOUBLE BLOCK & BLEED (DBB)

EDVC trunnion mounted ball valve seat ring can cut the medium service from upper stream to achieve double block function.
When the ball is fully open or closed position, even the valve is under medium pressure from both side, the body cavity and the pressure is blocked, and the remaining medium service in the cavity can bleed out through the drain hole or vent hole.

CAVITY PRESSURE RELIEF
When the pressure in cavity is increasing abnormally, the single piston effective seat can release the overloaded pressure automatically, while for the double piston effective seat designed ball valves, the overloaded pressure will be released through the automatic pressure relief device installed on the valve body.

note: Additional materials available upon request