Direct action pressure regulating valve overview
The direct-acting pressure regulating valve, specifically the ZMHN type, operates without the need for external energy sources or auxiliary power. It uses the energy from the controlled fluid itself to function and maintain a constant pressure either upstream or downstream of the valve. This valve is installed on the pipeline before the point of regulation. When the pressure in the membrane chamber increases, it overcomes the force generated by the spring (or hammer), causing the spool to move downward and gradually separate from the valve seat. This action increases the flow cross-section, allowing the pressure downstream to rise. Conversely, when the pressure in the membrane chamber is adjusted to a higher level, it overcomes the weight of the spring, pushing the spool downward to gradually close the valve seat, reducing the flow cross-section. The spool then moves upward, increasing the flow area again until the regulated pressure matches the set value.
In this way, the valve directly controls the pressure signal, ensuring that the pressure before the valve is reduced to the desired level. On the other hand, when the pressure in the diaphragm chamber acts effectively, it generates a force that pushes the valve core toward the valve seat, gradually closing the passage. This reduces the flow cross-section until the pressure before the valve rises back to the set value. The ZMHN direct-acting pressure regulator continuously adjusts its position based on the system's needs, maintaining stable and accurate pressure control without requiring additional power or complex mechanisms. Its simple design and reliable operation make it ideal for various industrial applications where precise pressure regulation is essential.
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