German Heyman valves Heyman models Heyman prices

Heyman valves are valves that reduce inlet pressure to a required outlet pressure through regulation and rely on the energy of the medium itself to automatically maintain stable outlet pressure. From the perspective of fluid mechanics, a pressure reducing valve is a throttling element with variable local resistance, i.e., by changing the throttling area, the flow velocity and kinetic energy of the fluid are altered, causing different pressure losses, thereby achieving pressure reduction. Then, through the adjustment of the control and regulation system, the fluctuation of the pressure downstream of the valve is balanced with the spring force, keeping the downstream pressure constant within a certain error range.

Heyman valve operating principle

The pressure reducing valve reduces water pressure by the local resistance of the flow channel inside the valve. The range of water pressure drop is automatically regulated by the pressure difference between the inlet and outlet on both sides of the diaphragm or piston connected to the valve disc. The fixed-ratio pressure reduction principle utilizes the water pressure ratio of the floating piston in the valve body for control; the pressure reduction ratio between the inlet and outlet ends is inversely proportional to the area ratio of the pistons on the inlet and outlet sides. This pressure reducing valve operates smoothly without vibration; there is no spring inside the valve body, eliminating concerns about spring corrosion and metal fatigue failure; the sealing performance is good with no leakage, thus reducing both dynamic pressure (when water is flowing) and static pressure (when flow rate is 0); especially, it reduces pressure without affecting the water flow rate. The pressure reducing valve regulates the flow rate of the medium by adjusting the opening degree of the closing member inside the valve body, reducing the pressure of the medium, while simultaneously using the downstream pressure to adjust the opening degree of the closing member, keeping the downstream pressure within a certain range, and injecting cooling water inside the valve body or downstream to reduce the temperature of the medium; this type of valve is called a pressure reducing and desuperheating valve. Kuaiyiyou Automation Selection includes pressure reducing valves. The characteristic of this valve is to maintain the outlet pressure and temperature values within a certain range even when the inlet pressure changes continuously.

Heyman valve installation precautions

1) Before installing the valve, carefully verify whether the model and specifications of the valve used match the design; 2) Check against the valve model and factory manual to determine if the valve can be applied under the required conditions; 3) When lifting the valve, the ropes should be tied to the flange connection between the valve body and the valve cover, and must not be tied to the handwheel or valve stem, to avoid damaging the valve stem and handwheel; 4) When installing the valve on a horizontal pipe, the valve stem should be vertically upward; downward installation of the valve stem is not allowed; 5) When installing the valve, do not use forced alignment connections by pulling or dragging, to avoid damage caused by uneven stress; 6) Rising stem gate valves should not be installed in underground damp locations to avoid corrosion of the valve stem.

Heyman valve troubleshooting

In certain pressure reducing control circuits, the outlet pressure of the pressure reducing valve is used to control the pressure of the control oil for electro-hydraulic directional valves or externally controlled sequence valves. When the electro-hydraulic directional valve or externally controlled sequence valve shifts or operates, the flow rate at the outlet of the pressure reducing valve becomes zero, but the pressure must still maintain the originally set value. In this case, since the outlet flow of the valve is zero, the flow passing through the pressure reducing port is only the pilot flow. Since the pilot flow is very small, generally within 2L/min, the main valve pressure reducing port is basically close to the fully closed position (extremely small opening), and the pilot flow exits from the triangular groove or inclined cone surface. If the fit of the main valve spool is too loose or the wear is excessive, the leakage increases. According to the continuity theorem of flow, this part of the leakage must also flow from the damping hole of the main valve spool, meaning the flow through the damping hole consists of two parts: the pilot flow and the leakage. Since the area of the damping hole and the oil pressure in the main valve spring chamber remain unchanged (the oil pressure in the spring chamber is determined by the pre-compression amount of the adjusted pressure regulating spring), an increase in the flow through the damping hole will inevitably cause the oil pressure in the lower chamber of the main valve to rise. Therefore, after the outlet pressure of the pressure reducing valve is set, if the outlet flow is zero, the outlet pressure will rise due to excessive looseness or wear of the main valve spool fit.

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