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Pump Protection Valve

vatac-valves company

Pump Protection Valve

Country/Region China

Product Details

Vatac Valves (Quzhou) Corp is one of the best China pump protection valve manufacturers, welcome to wholesale cheap pump protection valve from our factory.

Pump Protection Valve

Pump Protection Valve

In the process industry there is a requirement to protect pumps against the damaging effects of reverse flow and pump overheating owing to minimum flow (insufficient flow) through the pump not being maintained.

Pump protection valves are required to ensure the minimum flow rate of a pump at all times. This protects the pump against overheating, cavitations and finally, destruction. If the flow through the pump falls below a certain level the bypass system opens and the fluid will be re-circulated providing the required minimum flow for the pump.

The Vatac pump protection valves work in a modulating way. Should the discharge increase through the following processes, then the amount of fluid re-circulated by the bypass is automatically reduced- and vice versa. This increases the efficiency of the entire system and optimizes the economy in the low-load operation.

Pump Protection Valve

Protection Against Reverse Flow

Two types of automatic protection valves exist to protect pumps from reverse flow:

* Tilting disc check valve

* Combined shut off and non-return valve

The difference between the two solutions is that for a tilting disc check valve the non-return function is achieved automatically via a counter-weight attached to the valve lever that ensures valve is normally closed.The counterweight is sized so that flow (upstream pressure) is required to open the valve which overcomes the effect of the counter-weight. The disadvantage of this type of valve is that the valve is never fully open such the the full valve flow coefficient is attained. As a result there are pressure losses in the system which lead to potentially costly pumping inefficiencies.

An improvement on the tilting disc check valve” is the combined shut off and non return valve”. This design valves FULLY OPENS when flow upstream is detected, and FULLY CLOSES when there is no flow or reverse flow detected. This is achieved by providing an actuator and a control system to control the position of the valve.

Protection Against Minimum Flow Through Pump

* Automatic Recirculation Valves (ARVs)

Automatic Recirculation Valves are designed as a safety device to prevent pump instability, overheating, and cavitation by ensuring that there is always a minimum flow through the pump in response to varying process conditions. This type of valve is self-acting (i.e. mechanical device not requiring any actuators) that is a simple but effective alternative to using a more complicated control valve system.

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