The 700X water pump control valve is installed at the outlet of the water pump for water supply, air conditioning, and fire protection piping systems. The medium is water, and the temperature is ≤80°C. When the water pump needs to stop working, the main valve is closed by 90% by the inlet water pressure, and then the water pump is controlled to stop by the stroke switch, and the remaining 10% is closed by the return water. With non-return function, it can effectively prevent water hammer and protect the water pump.
It consists of main valve, solenoid valve, check valve, travel switch, needle valve, ball valve and other components.
How the 700X water pump control valve works
When the water pump is working and the water supply starts through the valve, first the solenoid valve is energized and opened, and the water enters the main valve control room through the needle valve and the check valve (1), and then flows through the solenoid valve and the ball valve to the outlet, and the upper chamber of the main valve diaphragm Reduced pressure. In the other way, because the check valve (2) on the conduit is closed, the medium cannot flow out. Under the action of the pressure difference between the upper and lower chambers of the diaphragm, the main valve core opens to start normal water supply.
When the water supply needs to be stopped, the solenoid valve is closed, the upper cavity of the main valve diaphragm stops draining, the pressure in the control chamber rises, and the main valve core starts to close. When it is closed to 90%, the travel switch on the upper part of the main valve outputs a signal to stop the pump, and the water pump stops running. At this time, the downstream return water enters the main valve control room through the check valve (2). Since the check valve (1) is closed, the medium in the upper chamber of the diaphragm cannot flow out, and the pressure of the chamber increases, and the main valve gradually closes.
Instructions for use of 700X water pump control valve
1. When the solenoid valve is opened, the main valve is opened. After the solenoid valve is closed, the main valve is closed by 90%, and after the water pump stops, the main valve is slowly closed. Solenoid valve voltage is commonly used as AC AC220V or DC DC24V, normally closed. When the solenoid valve coil is damaged. The solenoid valve can be closed. In turn, the main valve remains closed. The solenoid valve can also be normally open, and the main valve remains normally open at this time. Select the normally open and normally closed states of the solenoid valve according to the process needs and safety.
2. The needle valve on the conduit can adjust the closing time of the main valve. Turning off the small needle valve clockwise can lengthen the closing time of the main spool, which has the effect of slow closing and reduces the phenomenon of water hammer. Increase the opening of the needle valve counterclockwise, and the closing time of the main valve will become faster. The closing time of the main valve is adjustable within 30S-60S.
3. The stroke switch is controlled by the main valve core. When the main valve core is closed by 90%, the output signal is sent to the water pump control circuit, and the water pump stops working. Some use swing arm switches, and some use proximity switches.
4. A filter should be installed in front of the main valve to prevent impurities from clogging the conduit, needle valve, solenoid valve, and check valve. Impurities can also cause the main spool to close laxly, causing the valve control to fail.
Structural features of 700X water pump control valve
1. The electric regulating valve is the execution unit of the instrument in the automatic control system, which is powered by AC220V power supply voltage, and accepts the input (4-20mA, 0-10mA or 1-5VDC) current signal from DCS, PLC system or regulating instrument, operator, etc. Or voltage signal, can control the operation, adopt 381L or PSL type and other all-electronic electric actuators, with internal servo operation and opening signal position feedback, position indication, manual operation and other functions, the structure design of mechatronics, the function Strong, reliable performance, simple connection, high adjustment accuracy, the thrust output by the straight stroke changes the valve opening displacement, and achieves precise adjustment and control of the process parameters of the fluid medium. 2 Electric control valves can be divided according to the action mode;
Positive action: electric closed type - normally open type (when the electric signal increases, the valve position moves downward), "Type B"
Reaction: Electric open type - normally closed type (when the electric signal increases, the valve position moves upward), "K type"
3. The electric control valve is a straight-through single-seat cast ball valve with a single-seat plunger valve core. It is suitable for working conditions where the leakage is strictly required, the pressure difference between the front and rear of the valve is small, and the medium has a certain viscosity or contains fiber impurities.
4. Straight-through low flow resistance single seat is a top-guided structure without bottom cover, it has only one valve seat and one plunger-shaped valve core, which has good sealing performance, small leakage, sensitive action, S streamlined fluid channel, small pressure drop loss, Large capacity, precise flow characteristics, large adjustable ratio, large guiding area of the valve core guide part, and strong anti-vibration performance. It is suitable for occasions with strict requirements on medium leakage and adjustment accuracy. The reason is that the unbalanced force on the valve stem is relatively large, especially under the condition of large nominal diameter, so the valve is only suitable for occasions with small working pressure difference.
5. By changing the design of the spool shape; different spool shapes will get different flow characteristic values: equal percentage (logarithmic), linear, quick opening characteristics.
6. According to the requirements of working conditions, the valve core can be designed and manufactured; soft sealing structure (suitable for acid-base, gas and other media that require tight sealing in the temperature range of -20~+120°C).
This series of products are widely used in automatic adjustment and remote control of industrial production processes such as chemical industry, petroleum, metallurgy, power station, textile, papermaking and pharmaceuticals. There are standard normal temperature type, high temperature heat dissipation type, low temperature elongation type, bellows sealing type, jacket insulation type and other varieties. Product pressure grades are PN1.6 4.0 6.4MPa; nominal diameter DN15~200mm; minimum valve core DN6mm. The applicable fluid temperature is -100~+550℃.
700X water pump control valve exporter
Shanghai Mingguan Valve Co., Ltd. has produced water system valves for many years and has very rich experience. The 700X water pump control valve produced by the company has superior performance, low failure frequency, broad market prospects, and is deeply trusted by consumers. If you need 700X water pump control valve, please contact us at shmgoffice@163com or call: +86-021-66403155, we will serve you wholeheartedly.
