The new multifunctional pump control valve installed on the outlet pipe of the centrifugal pump has three functions: a gate valve, a check valve, and a water hammer eliminator. This article describes the structure, performance parameters, working principle, device commissioning, and precautions for the multifunctional water pump control valve.
First, the functional requirements of the multifunctional pump control valve
In order to ensure the normal operation of the pump, the centrifugal pump is the most commonly used type of pump in the water supply and drainage project. The water outlet pipe of the water pump is equipped with three kinds of valve parts: gate valve, check valve and water hammer eliminator. These three valve parts play different roles in the operation of the water pump: the valve is normally closed. When the pump starts, the valve opens slowly. When the pump stops, the valve closes slowly. The closing of the water pump and the closing and stopping of the brake can effectively prevent the water hammer of the pump from being turned on and stop the water hammer of the pump. At the same time, the motor load at the start of the water pump is reduced, and the shaft power of the water pump at the zero flow rate is the smallest, generally only the design axis. 30% of power. Another function of the gate valve is that when the gate valve is closed, it can provide safe inspection conditions for the valve and water pump, such as the check valve installed between the gate valve and the pump, to prevent backflow of water from the pressure pipe; the check valve can prevent sudden power off. The flow direction of the water flow caused by the time is changed to prevent backward flow; however, the sudden closing of the check valve is liable to produce a water hammer phenomenon. When the height of the pump's geometric lift is high, severe high-pressure hammers can cause pipeline rupture and serious production accidents. To prevent water hammer damage to water pipelines, water hammer eliminators are often installed on the pressure pipes of the pumps. In order to realize the automation of water pump operation, simplify management, reduce labor and improve reliability, people replace valves and electric valves with manual valves, and perform various technical improvements on the single valve, presenting slow-opening slow-closing check valves, slow motion Open and close hydraulic valves, automatic slow closing gate valves, two-speed self-closing valves and other new valves.
However, it is still unsatisfactory. The above measures have achieved certain results in application practice. The use of pressure sensing and electric drive to control more complex faults, the improvement of a single valve can not solve the main problem of automatic operation. Therefore, people have been working on the development of a valve that has the functions of three kinds of valve parts, a gate valve, a check valve, and a water hammer eliminator, so as to reduce the floor space while satisfying the above comprehensive requirements. JD745X multi-function water pump control valve is one of the better ones. It has the advantages of a multi-valve, reliable operation, simplified operation, easy maintenance and automatic operation according to the operation requirements of the water pump. It is very popular among users.
Operating pressure greater than or equal to O.1MPa medium temperature at 080 °C, slow closing time can be adjusted within 3-90, the pressure loss of the pipe flow rate 2ms is less than 0.01MPa, this type of multi-function pump control valve operating pressure is divided into 1. 0MPa and 1.6MPa 2.5MPa three. Water hammer peak working pressure less than 1.5 times, nominal diameter DN50-DNl0000
Second, the basic structure
Consists of a main valve and exterior accessories. Among them, the overall size of the valve is equivalent to an ordinary check valve. The main valve includes a valve body, a pressure plate and a diaphragm, a large valve plate, a slow closing valve plate, a valve seat, a stem assembly and the like. The valve stem assembly of the slow closing valve plate is connected with the pressure plate and the diaphragm, and the diaphragm is pressed between the valve cover and the diaphragm seat. The up and down motion of the diaphragm drives the slow closing valve to move up and down. The valve stem passes through the center hole of the large valve plate, so that the large valve plate can slide along the valve stem within a certain range. At ordinary times, the large valve plate is pressed against the valve seat under the pressure of its own weight and the upper compression spring, so that the valve is closed. The external accessories of the multifunctional water pump control valve are installed on both sides of the valve diaphragm and the inlet and outlet pipes of the valve. The control valve, the filter and a special counter-stop are installed on the connecting pipe of the lower cavity of the diaphragm and the inlet side of the valve. valve. Only the filter and a control valve are provided on the connecting pipe of the upper chamber of the diaphragm and the outlet side of the valve. The movement and the position of the large valve plate and the slow closing valve plate in the main valve determine the change and opening and closing of the valve working state. The external accessories and piping of the valve convey the pressure changes before and after the valve at any time to the upper and lower chambers in the valve that are divided by the diaphragm to control the movement of the large valve plate and the slow closing valve plate, and the large valve plate can be changed by adjusting the accessories. Relieve the operating speed of the valve plate so that the opening and closing times of the valve are within the specified range.
Third, the working principle
The multi-function water pump control valve is automatically operated when the water pump is started or closed. The following is a discussion of the working principle of the pump control valve. The pump plate is completely closed at the inlet end and the diaphragm upper chamber static pressure.
First, the functional requirements of the multifunctional pump control valve
In order to ensure the normal operation of the pump, the centrifugal pump is the most commonly used type of pump in the water supply and drainage project. The water outlet pipe of the water pump is equipped with three kinds of valve parts: gate valve, check valve and water hammer eliminator. These three valve parts play different roles in the operation of the water pump: the valve is normally closed. When the pump starts, the valve opens slowly. When the pump stops, the valve closes slowly. The closing of the water pump and the closing and stopping of the brake can effectively prevent the water hammer of the pump from being turned on and stop the water hammer of the pump. At the same time, the motor load at the start of the water pump is reduced, and the shaft power of the water pump at the zero flow rate is the smallest, generally only the design axis. 30% of power. Another function of the gate valve is that when the gate valve is closed, it can provide safe inspection conditions for the valve and water pump, such as the check valve installed between the gate valve and the pump, to prevent backflow of water from the pressure pipe; the check valve can prevent sudden power off. The flow direction of the water flow caused by the time is changed to prevent backward flow; however, the sudden closing of the check valve is liable to produce a water hammer phenomenon. When the height of the pump's geometric lift is high, severe high-pressure hammers can cause pipeline rupture and serious production accidents. To prevent water hammer damage to water pipelines, water hammer eliminators are often installed on the pressure pipes of the pumps. In order to realize the automation of water pump operation, simplify management, reduce labor and improve reliability, people replace valves and electric valves with manual valves, and perform various technical improvements on the single valve, presenting slow-opening slow-closing check valves, slow motion Open and close hydraulic valves, automatic slow closing gate valves, two-speed self-closing valves and other new valves.
However, it is still unsatisfactory. The above measures have achieved certain results in application practice. The use of pressure sensing and electric drive to control more complex faults, the improvement of a single valve can not solve the main problem of automatic operation. Therefore, people have been working on the development of a valve that has the functions of three kinds of valve parts, a gate valve, a check valve, and a water hammer eliminator, so as to reduce the floor space while satisfying the above comprehensive requirements. JD745X multi-function water pump control valve is one of the better ones. It has the advantages of a multi-valve, reliable operation, simplified operation, easy maintenance and automatic operation according to the operation requirements of the water pump. It is very popular among users.
Operating pressure greater than or equal to O.1MPa medium temperature at 080 °C, slow closing time can be adjusted within 3-90, the pressure loss of the pipe flow rate 2ms is less than 0.01MPa, this type of multi-function pump control valve operating pressure is divided into 1. 0MPa and 1.6MPa 2.5MPa three. Water hammer peak working pressure less than 1.5 times, nominal diameter DN50-DNl0000
Second, the basic structure
Consists of a main valve and exterior accessories. Among them, the overall size of the valve is equivalent to an ordinary check valve. The main valve includes a valve body, a pressure plate and a diaphragm, a large valve plate, a slow closing valve plate, a valve seat, a stem assembly and the like. The valve stem assembly of the slow closing valve plate is connected with the pressure plate and the diaphragm, and the diaphragm is pressed between the valve cover and the diaphragm seat. The up and down motion of the diaphragm drives the slow closing valve to move up and down. The valve stem passes through the center hole of the large valve plate, so that the large valve plate can slide along the valve stem within a certain range. At ordinary times, the large valve plate is pressed against the valve seat under the pressure of its own weight and the upper compression spring, so that the valve is closed. The external accessories of the multifunctional water pump control valve are installed on both sides of the valve diaphragm and the inlet and outlet pipes of the valve. The control valve, the filter and a special counter-stop are installed on the connecting pipe of the lower cavity of the diaphragm and the inlet side of the valve. valve. Only the filter and a control valve are provided on the connecting pipe of the upper chamber of the diaphragm and the outlet side of the valve. The movement and the position of the large valve plate and the slow closing valve plate in the main valve determine the change and opening and closing of the valve working state. The external accessories and piping of the valve convey the pressure changes before and after the valve at any time to the upper and lower chambers in the valve that are divided by the diaphragm to control the movement of the large valve plate and the slow closing valve plate, and the large valve plate can be changed by adjusting the accessories. Relieve the operating speed of the valve plate so that the opening and closing times of the valve are within the specified range.
Third, the working principle
The multi-function water pump control valve is automatically operated when the water pump is started or closed. The following is a discussion of the working principle of the pump control valve. The pump plate is completely closed at the inlet end and the diaphragm upper chamber static pressure.
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