Preset Valves provide an accurate & automatic control of a pre-determined quantity of liquid to be delivered through the Flow Meter. A typical Preset arrangement consists of a Preset Valve mounted on the Flow Meter outlet & connected by a mechanical linkage to the Preset Register fitted below the Flow Meter Counter.

DESIGN FEATURES

• Compact design.
• Low pressure drop.
• Accurate shut-off.
• Bubble tight two stage cushioned closure.
• Batch quantity up to 99999 litres.
• Emergency stop facility.
• Optional electrical Preset Switch for remote pump control.

PRINCIPLES OF OPERATION

The Preset Valve is of a pilot operated, hydraulically actuated design, which ensures an easy opening & two stage cushioned closure. It consists of a main valve & a pilot valve. The pilot valve is connected to the Preset Register through an adjustable linkage. To commence operation, the required delivery quantity is set on the Preset Register by the help of push buttons. The Flow Meter Counter is reset to zero. Liquid delivery is initiated by pulling the Preset handle. This actuates the linkage to move the pilot valve, which drains the pressurised liquid in the main valve causing a pressure drop across the main valve to open it. At the end of the delivery, the Preset Register knock-off plate gets released in two stages, moving the linkage connected to it & allowing the main valve to gradually close in two stages. The rubber bonded seal fitted on the main valve ensures a bubble tight shut-off. The cushioning action of the valve is adjustable with the help of a needle valve fitted on the pilot valve cover.

APPLICATIONS

• Road tanker & rail wagon gantry filling.
• Custody transfer & inventory control.
• Batching, blending & dispensing in petroleum, petrochemical & process control industries.