HAWE PM Series Miniature Proportional Pressure Reducing Valve Product Introduction

Brand

HAWE/Germany

Application Areas

Environmental Protection, Chemical Industry, Automotive & Parts, Electrical, General

HAWE PM Series Miniature Proportional Pressure Reducing Valve Product Introduction

HAWE PM series miniature proportional pressure reducing valves control other hydraulic components (e.g., directional valves) in hydraulic systems with variable control pressure and less oil volume. The secondary pressure at port A, related to current control, does not depend on the pump's output pressure; there is a linear relationship between the pressure at port A and the current input signal. Due to functional requirements, any existing leakage must return to the tank without pressure through port R. This type of pressure reducing valve has an overload balancing function (acting as a pressure relief valve) when the secondary pressure exceeds the set value due to external forces. Maximum pressure at port P: Pmax = 40 bar, maximum pressure at port A: Pmax = 19 bar, maximum flow rate: Qmax = 2 l/min. The pilot valve opens by turning the top adjusting bolt clockwise, causing the spring to compress and the diaphragm to concave downwards. The force acting on the pilot valve connecting rod displaces it downwards, opening the pilot valve. When the pilot valve opens, steam from chamber A in the upstream steam inlet pipe section passes through channel α (steam supply regulating channel), enters the pilot valve's annular steam chamber, and is directly delivered to the upper chamber of the piston cylinder below via channel β. With the continuous supply of steam to chamber A, the pressure continuously increases, pushing the piston downwards to open the main valve. At this time, steam continuously flows from chamber A to chamber B. When the load in chamber B of the downstream outlet pipe section is sufficient, the excess steam causes the pressure in chamber B to continuously rise. The continuously increasing pressure is fed back to the lower chamber of the pilot valve diaphragm through channel γ (pressure sensing channel), causing the pilot valve diaphragm to bulge upwards, overcoming the pressure of the upper regulating spring, and the pilot valve is partially closed or closed. Thus, the steam source from the upstream channel α is partially or completely shut off. When the pressure in the upper chamber of the piston cylinder decreases, the main valve is partially closed or closed under the action of the return spring below. At this time, the pressure in chamber B begins to decrease, and this cycle repeats to achieve pressure regulation.

The HAWE PM series miniature proportional pressure reducing valve reduces the inlet pressure to a desired outlet pressure through adjustment, and automatically maintains a stable outlet pressure by relying on the energy of the medium itself. From a fluid mechanics perspective, the pressure reducing valve is a throttling element with variable local resistance. That is, by changing the throttling area, the flow velocity and kinetic energy of the fluid are changed, resulting in different pressure losses, thereby achieving pressure reduction. Then, through the adjustment of the control and regulation system, the fluctuation of the downstream pressure is balanced with the spring force, keeping the downstream pressure constant within a certain error range.

The HAWE PM series miniature proportional pressure reducing valve reduces the inlet pressure to a desired outlet pressure through adjustment, and automatically maintains a stable outlet pressure by relying on the energy of the medium itself.

A pressure reducing valve is a specialized device that automatically reduces the working pressure of a pipeline. It can reduce the higher liquid pressure in the upstream pipeline to the required level in the downstream pipeline. The transmission medium here is mainly water. Pressure reducing valves are widely used in high-rise buildings, areas with excessively high water pressure in urban water supply networks, mines, and other applications to ensure that each water point in the water supply system receives appropriate service water pressure and flow.

Since water leakage and waste are almost directly proportional to the water pressure in the water supply system, pressure reducing valves improve system operating conditions and have potential water-saving effects; statistics show that their water-saving effect is approximately 30%. There are many types of pressure reducing valves, with diaphragm type and internal spring piston type being the most common in the past.

The basic operating principle of a pressure reducing valve is to reduce water pressure by the local resistance of the flow channel inside the valve. The range of water pressure drop is automatically adjusted by the pressure difference between the inlet and outlet water on both sides of the diaphragm or piston connected to the valve disc.

The principle of proportional pressure reduction utilizes the water pressure ratio control of a floating piston within the valve body. The pressure reduction ratio at the inlet and outlet ends is inversely proportional to the piston area ratio on both sides. This type of pressure reducing valve operates smoothly without vibration, further improving domestic pressure reducing valve manufacturing technology. The valve body contains no springs, eliminating concerns about spring corrosion and metal fatigue failure. It boasts excellent sealing performance with no leakage, thus reducing both dynamic pressure (when water is flowing) and static pressure (when the flow rate is 0). Notably, it does not affect the water flow rate while reducing pressure. Pressure reducing valves are typically available in various sizes from DN15 to DN100, with upstream and downstream working pressures of <1MPa and 0.1–0.5MPa respectively, and a pressure adjustment range error of ±5%–10%. JB/T2203–1999, "Structural Length of Pressure Reducing Valves," is the main standard for general applications. Currently, most domestic pressure reducing valve manufacturers design and produce according to this standard, but this standard is not exhaustive, and specifications are not complete. For example, the maximum nominal diameter for gas pressure reducing valves is DN500, and for water pressure reducing valves, it is DN1000. Based on the specifications of the pressure reducing valves produced by the manufacturers and the information available, the connection dimensions of different manufacturers are not entirely consistent. For example, for DN500 gas pressure reducing valves, it is recommended that the General Machinery Research Institute revise JB/T2203-1999 "Structural Length of Pressure Reducing Valves". It is recommended that design institutes and users select according to standards, and that pressure reducing valve manufacturers design and manufacture according to standards.

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