Constant Pressure Valve

With both opening and closing valve parts being aligned along a single axis, the pilot valve performs excellent pressure control under any condition.

The unique closure mechanism realizes complete water shutoff performance. The set outlet pressure is maintained even in the fully closed condition, therefore costs for pipes on the downstream side of the valve can be reduced.

The pilot valve does not have any minute, fixed restriction passage like a needle valve, and is therefore clog-resistant.
And, even if clogging by foreign material occurs, the built-in self-cleaning mechanism causes the clogged valve part to open automatically to remove the foreign material.

Due to its simple construction, troublesome adjustments are unnecessary. Being excellent in durability and practically maintenance-free, using this valve reduces maintenance costs.

Specifications of Constant Pressure Control Valve

• Inlet pressure (Primary pressure)
  Max. 1MPa (For JIS 10K standard)
• Outlet pressure (Secondary pressure)
  50kPa or more
• Pilot Valve type
  2nd pressure is Max. 0.7MPa : PLV (diaphragm type)
  2nd pressure is more than 0.7MPa: PLV-H (piston type)
• Set pressure adjustment range
  +/- 70kPa
• Operating differential pressure
  50kPa or more

Constant Pressure Control Valves Manufacturer

Constant Pressure Pump Control Valve “City Like Pressure”, which helps reduce rapid pump cycling and maintains a pre-set operating pressure. It provides proven pump cycling protection for water well systems, irrigation, and booster systems and is designed to stop rapid pump cycling, save electricity, and eliminate water hammer while providing a constant pressure regardless of water flow.

Components of Constant Pressure Control Valves

• Constant Pressure Adjustment: There is a hole in the middle of the part. The high pressure in the bottle is injected into the constant pressure chamber through the hole. The constant pressure can be controlled by adjusting the distance between the part and the constant pressure gasket.
• Constant pressure gasket: The function is to block the middle hole of the constant pressure adjusting bolt. The high pressure in the bottle passes through the middle hole of the constant pressure adjusting bolt, flows through the gap between the valve body and the constant pressure valve core, and enters the core central hole. Finally, it reaches the air chamber. With the pressure increasing gradually, the constant pressure valve core is pushed in the direction of the constant pressure-adjusting bolt. When the pressure reaches a certain value, the constant pressure sealing gasket connected with the valve core is tightly blocked. Hold the constant pressure-adjusting bolt to achieve the goal of constant pressure.
• One-way valve ball: This ball acts as a stopper when exhausting and prevents high pressure in the bottle from entering the gas chamber. When filling, open to let external high-pressure gas into the cylinder
• Exhaust hole: This hole is used to eliminate the “breathing” gas flow caused by the rapid movement of the spring part of the constant pressure valve core.
• Limit card: to prevent the constant pressure valve core from falling into the air chamber.

Working Principle of Constant Pressure Control Valve

The outlet top rod is pressed into the chamber-open valve top rod opening-seal gasket leaving the valve body-vent air discharging-chamber pressure decreasing-constant pressure core moving to the chamber under spring action-constant pressure seal gasket leaving the constant pressure regulating bolt-cylinder high pressure enters the chamber-open valve top rod closing-chamber pressure increasing-constant pressure valve core gradually pushing to the constant pressure regulating bolt-pressure to reach the value of * Constant pressure gasket to block the middle hole of constant pressure adjusting bolt… Complete constant pressure.

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What is a Constant Pressure Valve?

Constant pressure valves control the system pressure on the downstream side of the valve, i.e. to the tank, the pressure switch, and all points of usage in the house.

How does a Constant Pressure Valve work?

1. Intermediate pressure Pe, between inlet pressure (primary pressure) P1 and outlet pressure (secondary pressure) P2, is formed inside the pilot valve and is transmitted to the top of the main valve to maintain an appropriate main valve opening.
2. When the usage amount at the outlet side decreases and outlet pressure P2 rises above the set pressure, pilot A valve opens and pilot B valve closes to raise intermediate pressure Pe. This causes the main valve to become restricted and the outlet pressure to be reduced to the set pressure.
   Conversely, when the usage amount at the outlet side increases and outlet pressure P2 drops below the set pressure, pilot A valve closes and pilot B valve opens to reduce intermediate pressure Pe. This causes the main valve to open and the outlet pressure to be raised to the set pressure.
3. With the same mechanism, the pilot valve responds to the fluctuation of the inlet pressure, thereby automatically adjusting the main valve opening appropriately and maintaining the outlet pressure at the set pressure.
4. In the fully closed condition, the pilot B valve is closed completely by the outlet pressure and, at the same time, the inlet pressure is received effectively by the top of the main valve. The main valve is therefore shut firmly and the inlet and the outlet sides are shut off completely.
5. The set pressure can be finely adjusted with the coil spring of the pilot valve.
   If the main valve, pilot A valve, or pilot B valve becomes clogged by foreign material, the clogged valve opens in response to the change of pressure due to clogging and automatically removes the foreign material.

Structural Composition of Constant Pressure Valve

There is a diaphragm and spool plunger system inside the valve. The system will react immediately to the change of product pressure to adjust its position so as to keep the preset pressure unchanged. The valve operates through a pressure regulating valve for compressed gas and a pressure gauge on the production line. The optimized main body design gives CPM-2 the advantages of products that include extremely high cleanliness. Because the inlet is 90 degrees from the bottom of the main body of the valve, there is no residual liquid accumulation. A special plunger design allows less liquid flow and higher CIP flow. The constant pressure control valve is mainly used to ensure the constant sample water pressure in the water vapor sampling device. It is suitable for the company’s manual sampling current-limiting regulator valve. It can achieve constant sample water pressure and current, improve the accuracy of instrument measurement, and solve the interference of sample water pressure and flow fluctuation on instrument measurement.

Working process of Constant Pressure Valves

• 1. Constant pressure control device can set the outlet pressure between 0.05 and 0.5 Mpa by adjusting the handwheel. When the inlet pressure fluctuates greatly, the opening of the valve is automatically adjusted inside the valve to keep the outlet pressure stable.
• 2. The constant pressure control device has the function of overpressure protection. When the outlet pressure exceeds the set value, the valve closes automatically to prevent instrument damage.

Advantages of Constant Pressure Valve

• Capable of working in both flow directions (upstream and downstream)
• Precise valve cone control with multi-layer flat diaphragm design (long service life)
• Perfected cleanability no dead areas, no crevices fully open valve for sufficient CIP throughput

Excellent Pressure Control and Complete Liquid Shutoff Performance

With both opening and closing valve parts being aligned along a single axis, the pilot valve performs excellent pressure control under any condition.

The unique closure mechanism realizes complete water shutoff performance. The set outlet pressure is maintained even in the fully closed condition, therefore costs for pipes on the downstream side of the valve can be reduced.

The pilot valve does not have any minute, fixed restriction passage like a needle valve, and is therefore clog-resistant.
And, even if clogging by foreign material occurs, the built-in self-cleaning mechanism causes the clogged valve part to open automatically to remove the foreign material.

Due to its simple construction, troublesome adjustments are unnecessary. Being excellent in durability and practically maintenance-free, using this valve reduces maintenance costs.

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