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Automatic recirculation pump protection valve

Used to prevent damage caused by overheating, severe noise, instability and cavitation when various centrifugal pumps are running below load. As long as the flow of the pump is lower than a certain value, the bypass return port of the valve will automatically open to ensure the minimum flow necessary for the liquid pump.

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Keywords: Valve

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Detailed introduction

Automatic recirculation pump protection valve
In the process of modern industrial equipment, centrifugal pumps are required to work in a state of variable flow, which requires automatic control equipment to be set up in the process.
 
. However, when the centrifugal pump is running below the load, it will cause damage to the pump due to overheating, serious noise, instability and cavitation. This is the need for an automatic recirculation set
 
When the pump is running below load, the minimum flow return cycle of the pump is achieved through the bypass.
Through years of research and development, continuous innovation and practice, Shanghai Shengtang Valve Technology Co., Ltd. has developed STZD series automatic recirculation pump protection valve. Used to prevent all kinds of separation
 
Damage caused by overheating, severe noise, instability and cavitation when the heart pump is running below load. As long as the flow rate of the pump is lower than a certain value, the bypass return of the valve
 
The port will automatically open to ensure the minimum flow necessary for the liquid pump.
 
Three types of protection:
continuous circulation system
The minimum demand flow of the pump of the continuous circulation system is independent of the process flow change of the system. After the minimum flow rate is set, it is directly returned to the storage tank through the decompression orifice plate, and the continuous
 
Although the minimum flow cycle can well protect the pump, the pump must provide greater output power to ensure that the system process flow plus the recirculation flow, resulting in additional
 
Waste of energy.
control circulation system
The control circulation system is composed of check valve, flow meter, minimum flow regulating valve and control system. The control loop system can provide minimum flow protection when the process flow
 
When the minimum flow rate is greater than the pump, the circuit is closed without additional energy loss. However, the system is complex, the control components are many, and the cost of purchase, installation and maintenance is relatively high.
Automatic Recirculation Valve System
The automatic recirculation valve integrates check valve, flow sensing, bypass control valve, and multi-stage pressure reduction functions. It does not require power source and control system, and does not require electrical wiring,
 
Intrinsically safe. The footprint is small, reducing the possibility of failure caused by high-speed fluids. Low installation and maintenance costs. Pumps that are preferred in modern industrial processes
 
ways of protection.
 
STZD series automatic recirculation pump protection valve
STZDT型:
Simple structure, low cost, long life, suitable for low pressure conditions; casting valve body, can choose carbon steel or stainless steel material, etc.; bypass flow is large, to the main flow
 
60%,KV value can be adjusted; Bypass working pressure difference to 4MPa; Pressure grade PN16-PN64 caliber DN25-DN400
STZDL型:
Porous cage bypass, low noise, suitable for medium and low pressure conditions; Forged valve body, carbon steel or stainless steel, etc.; Standard bypass with non-return function, work
 
Pressure difference to 6MPa; Main road non-return structure with Venturi flow passage to adapt to complex working conditions; Pressure grade PN16-PN100 caliber DN25-DN500; Optional increase
 
Manual bypass operation function for use in case of failure
STZDM型:
Anti-cavitation multi-stage decompression bypass, reduce the flow rate, suitable for high-pressure conditions; forged valve body, can choose carbon steel or stainless steel material, etc.; standard bypass with non-return function,
 
The working pressure difference is 30MPa; the pressure level is PN16-PN420 and the caliber is DN25-DN500; the manual bypass operation function can be added optionally for use in case of failure.
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