Multi-Function Slow-Opening Slow-Closing Check Valve Series

Multi-Function Slow-Opening Slow-Closing Check Valve Series

Multi-Function Slow-Opening Slow-Closing Check Valve Series ：

Product Overview

Our multi-function slow-opening slow-closing check valves (DYH41X, DY30BX, DY30AX) are designed and manufactured with reference to imported and domestic advanced products. They are mainly installed at the pump outlet pipelines of high-rise building water supply systems and other water supply systems to prevent medium backflow and eliminate water hammer. One valve combines three functions: electric valve, check valve, and water hammer eliminator, effectively improving the safety and reliability of water systems.

Product Features

1. Excellent Water Hammer Elimination: Integrates the technical principles of slow opening and slow closing to eliminate both pump-start and pump-stop water hammer effectively.

2. Automatic Operation: The valve opens and closes automatically according to pump operation procedures, controlled only by the pump motor start/stop button. 3. Energy-Saving & Compact Design: Features a wide-body, full-flow streamlined straight-through design with low pressure loss, high flow capacity, small volume, and light weight.

4. Adjustable Opening Pressure: Equipped with a pilot valve control system, the main valve opening pressure can be easily set and flexibly adjusted according to working conditions.

Working Principle & Structure

The valve consists of a main body, ball valves, filters, check valves, pilot valves, and a dual-chamber diaphragm (piston) actuator. When the pump starts, the pilot valve controls the slow opening of the main valve to avoid sudden pressure surges. When the pump stops, the combined action of the pilot system and spring ensures the main valve closes slowly, preventing backflow and water hammer. The modular design ensures reliable performance and easy maintenance.

Key Specifications

• Nominal Pressure: PN10 / PN16 / PN25

• Shell Test Pressure: 1.5 / 2.4 / 3.75 MPa (corresponding to PN10/16/25)

• Seal Test Pressure: 1.1 / 1.76 / 2.75 MPa (corresponding to PN10/16/25)

• Pressure Adjustment Range: 0.1~0.9 MPa (PN10), 0.15~1.4 MPa (PN16), 0.2~2.2 MPa (PN25)

• Applicable Media: Water, oil, and liquids with properties similar to water

• Working Temperature: 0°C ~ 80°C

• Installation Location: Pump outlet pipelines, water supply systems, high-rise buildings