SK720X Pressure reducing and stabilizing valve

The SK720X pressure-reducing and stabilizing valve is controlled by a pressure-reducing pilot valve and equipped with a diaphragm-type adjustable pressure-reducing pilot valve, needle valve, small filter, ball valve, and other components.

Normal water flow continuously enters the main valve through the inlet port via needle valve 1 into the upper control chamber 2. The diaphragm-type pressure-reducing pilot valve 3 is set to the desired pressure value; when the pressure downstream of the valve does not exceed this set value, the pilot valve remains fully open, preventing pressure buildup in the main valve's control chamber, and the main valve disc opens to allow water flow under pipeline pressure.

When the post-pressure exceeds the set value, the pressure-reducing pilot valve detects the post-pressure and slowly opens.

As the system approaches closure, the pressure in the upper control chamber gradually increases, forcing the diaphragm to drive the valve disc downward. The main valve slowly closes, reducing the pressure downstream to the set value of the pilot valve. When the downstream pressure falls below this set value, the pilot valve gradually opens, releasing the accumulated pressure in the upper control chamber and allowing the main valve to open progressively. The internal throttle orifice 5, which connects the lower control chamber of the main valve to the downstream outlet, ensures a smoother valve response. The ball valve 4 can be adjusted according to different operating conditions to regulate the discharge rate of water from the control chamber and stabilize the main valve's operation. If necessary, the ball valve 4 can be manually operated to close the main valve for emergency shut-off.

 ● Style Classification: Flanged pressure reducing and stabilizing valve

● Working pressure: PN10/16125

● Interface type: Should be installed horizontally、

● Standard to be implemented: GB5135.17 JB/T 10674

Essential parameter

Installation Instructions

① Verify that the valve nameplate, certificate of conformity, and cast markings on the valve body are consistent;

② Before installing the valve, thoroughly clean the pipeline to ensure it is free of stones, welding slag, and other debris.

③ The optimal installation method for the valve is horizontal mounting on the pipeline (with the valve cover positioned at the highest point vertically); the valve can still function properly in any other orientation.

④ A filter shall be installed before the main valve, and a maintenance gate valve shall be installed both before and after the main valve.

⑤ The valve must be installed with the water flow direction aligned with the arrow indicated on the main valve body; never install it in reverse.

⑥ The heads at both ends of the valve shall be removed before installation and only before installation to prevent impurities from entering the valve chamber.

⑦ After installing the valve on the pipeline, inspect all valves, pipes, and pipe joints for damage, distortion, loosening, or other defects.

⑧ After installing the valve on the pipeline, verify that all maintenance-oriented small copper ball valves are in the open position.

Structure size