The main control valve product names of China Control Valve Network include:Pneumatic piston fast cutting off valve,Pneumatic tank bottom ragulator,Pneumatic three eccentric butterfly valve(Fork cylinder),Pneumatic V-shaped adjustable control valve,Pneumatic valve locator,Proximity switch,PS series electric actuators,QYH641 pneumatic "O"type regulative cutting off control valve.

1. What is a Multi-functional Pump Control Valve?

The JD745X is a specialized hydraulic-operated valve designed to replace traditional multiple-valve configurations. By integrating the functions of flow cut-off (gate valve), backflow prevention (check valve), and surge protection (water hammer arrestor), it ensures automated, safe operation.

Through hydraulic self-control, it allows the pump to start at zero-flow (reducing motor load to ~30% of rated power) and implements a controlled, slow-closing sequence to eliminate stop-pump water hammer.

2. JD745X Core Construction and Technical Specifications

The JD745X features a compact design consisting of the main valve and external pilot accessories.

Main Valve Structure: Includes the valve body, diaphragm seat, large valve disc (main), slow-closing disc, and stem assembly.

Power Mechanism: A diaphragm divides the control chamber into upper and lower sections. The pressure differential across the valve drives the stem's vertical movement. The large disc slides along the stem, utilizing spring tension to ensure tight sealing.

Key Performance Indicators:

Nominal Pressure: 1.0 MPa, 1.6 MPa, 2.5 MPa.

Adjustable Closing Time: 3s to 90s (to mitigate shock).

Low Pressure Loss: < 0.01 MPa at a flow velocity of 2m/s.

Media Temperature: 0°C to 80°C.

3. Automated Control Logic and Working Principle

The JD745X operates entirely on line pressure, requiring no external electricity or sensors:

Pump Start Sequence

Upon pump activation, inlet pressure enters the lower diaphragm chamber through external pilot tubing. This overcomes the upper chamber pressure and spring resistance, gradually lifting the slow-closing disc. This "soft start" protects the motor from high-torque loads.

Pump Stop sequence

The moment the pump stops, outlet pressure is transmitted to the upper diaphragm chamber. The large disc closes rapidly to prevent backflow. Subsequently, the slow-closing disc returns to its seat under spring force, dissipating the remaining kinetic energy to prevent water hammer.

Emergency Power Failure

During a sudden power outage, the valve relies on its internal spring force and hydraulic stored energy to execute an automatic closing sequence, preventing catastrophic pipe bursts.

4. Why Choose the JD745X? (Engineering Advantages)

For design engineers and plant managers, the JD745X offers several decisive benefits:

Operational Simplicity: Eliminates the need for complex electrical actuators or pressure sensors, drastically reducing failure rates.

Cost & Space Savings: Reduces the total length of the pump house piping and lowers the overall footprint.

Energy Efficiency: The streamlined internal flow path minimizes pressure drop, reducing long-term pumping costs.

Pro-Tip for Maintenance: To maintain optimal sensitivity, always ensure the external pilot filters are cleaned regularly to prevent clogging in the hydraulic control loop.

Do you still need to know or purchase the following control valve products:

• ZAJQ electric adjustable control valve
• ZAJV electronic type electric v-type regulating control valve
• ZHJP（low temperature type）pneumatic single seat control valve
• ZYH673 pneumatic knife gate valve
• ZYHSY electronic control peumatic trap

2026-02-02

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