Introduction to Puhui brand flow control valve
Flow control valve 400x manufacturer
Flow control valve 400x manufacturer_Botou Puhui Electromechanical Equipment Factory. Persist in producing the best 400X and L741X flow control valves. Botou Puhui is a manufacturer located in Cangzhou, Hebei Province, North China. It is managed and produced by a reputable manufacturer, providing you with flow control valves of 400x model L741X， Each specification has a minimum diameter of DN40 and a maximum diameter of DN600. Pressure levels are 1.0MPa, 1.6MPa, and 2.5MPa. Accurate flow control, convenient adjustment, long service life, and durability. Use the best flange connection method.
Flow control valve 400x function
Usage of flow control valves 400x and L741XFlow control valveIt is a multifunctional valve that uses high-precision pilot control to control flow. Suitable for pipelines that require control of flow and pressure in water distribution pipes, maintain the predetermined flow rate constant, limit excessive flow to a predetermined value, and appropriately reduce upstream high pressure. Even if the pressure upstream of the main valve changes, it will not affect the flow downstream of the main valve.
Working principle of flow control valves 400x and L741X:
Product features of flow control valve: This product deviates from the conventional throttling valve that uses orifice plates or pure mechanical methods to reduce the drainage area. It utilizes relevant pilot valves to minimize energy loss during the throttling process; This product has high control sensitivity, safety and reliability, easy debugging, and long service life.
When the flow rate through the limiting orifice plate decreases, the pressure difference on both sides of the orifice plate also decreases. The spring action of the guide valve is used to open the guide valve, and the flow rate increases again to reach the set value. When the flow rate through the limiting orifice plate increases, the pressure difference on both sides of the orifice plate also increases, and the spring of the pilot valve is compressed, causing the pilot valve to tend to close. The main valve is also pushed to the closed position, and the flow gradually decreases to reach the set value.
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The following picture is a typical installation diagram of flow control valves 400x and L741X. It can be clearly seen from the picture that the main pipeline is equipped with a bypass pipeline; Elastic seat sealed gate valves are installed before and after the flow control valve, and are installed on the bypass pipelineElastic seat sealed gate valveThis kind of supporting installation will be very convenient for maintenance and use in the future.
Name of flow control valve 400x directional valve system：
| Component A |
Name: Main Valve |
Material: Cast Iron |
| B |
Upstream valve |
Nickel plated brass |
| B1 |
Downstream valve |
Nickel plated brass |
| C |
exhaust valve |
brass |
| D |
block valve |
Nickel plated brass |
| D1 |
Flow orifice plate |
Stainless Steel - Steel |
| G |
filter |
brass |
| H |
Needle Valve |
stainless steel |
| I |
flow control |
brass |
| J |
One-way valve |
brass |
| U |
Directional valve (CHY200X type) |
Bronze stainless steel |
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◆Performance parameters of flow control valve 400x
| model |
L741X-10 |
L741X -16 |
L741X -25 |
| Work pressure (MPa) |
1.0 |
1.6 |
2.5 |
| Applicable temperature (℃) |
0~80 |
| Applicable Medium |
water |
| material |
Valve body and valve cover |
cast iron |
| valve stem |
chromium stainless steel |
| Valve seat, valve disc |
bronze |
| diaphragm |
nbr |
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Puhui Flow Control Valve 400x provides free installation solutions from professional manufacturers.
Debugging Method for 400X Flow Control Valve
1. Normally, the pressure of the product when it leaves the factory is P1=0.6MPa P2=0.3MPa， The needle valve is in a 2-turn opening state.
2. The valve does not require static debugging (the pressure behind the valve is 0.05MPa higher in static state than in dynamic state).
Dynamic debugging
1. Open the needle valve twice.
2. Unscrew the anti loosening nut, open the adjustable pressure reducing valve, loosen the adjustable bolt counterclockwise, and fully open the ball valve.
3. Open the elastic seat sealed gate valve after opening the valve, and open the elastic seat sealed gate valve before opening the valve.
4. If there is a "hunting vibration" phenomenon during the initial operation (i.e. the valve disc moves up and down too frequently), the needle valve opening should be slightly closed in the direction of the needle to reduce the closing speed of the shut-off port and eliminate the "hunting vibration" phenomenon. Adjust to run smoothly.
5. Adjust the adjustable pressure reducing valve adjusting bolt clockwise until the pressure behind the valve reaches the required value. If the pressure after adjusting to the valve is greater than the required value, the adjustable nut must be loosened a certain number of turns and then readjusted.
6. Tighten and loosen the nut.
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