German Rieger valves Rieger models Rieger prices

Rieger 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 a fluid mechanics perspective, a pressure reducing valve is a throttling element with variable local resistance; it changes the throttling area to alter flow velocity and fluid kinetic energy, creating different pressure losses to achieve pressure reduction. Then, through the adjustment of the control and regulation system, the fluctuation of downstream pressure is balanced with the spring force, keeping the downstream pressure constant within a certain error range.

Rieger 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 water 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 uses 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. It has good sealing performance without leakage, thus reducing both dynamic pressure (when water is flowing) and static pressure (when flow rate is 0); especially, it reduces pressure without affecting water flow rate. The pressure reducing valve regulates medium flow by adjusting the opening degree of the closing member inside the valve body, reducing medium pressure, while simultaneously using the downstream pressure to adjust the opening degree of the closing member, keeping downstream pressure within a certain range. Cooling water is injected inside or after the valve to lower the medium temperature; such a valve is called a pressure reducing and desuperheating valve. Kuaiyiyou Automation Selection includes this pressure reducing valve. A characteristic of this valve is maintaining outlet pressure and temperature values within a certain range even when inlet pressure constantly changes.

Rieger 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, ropes should be tied at the flange connection between the valve body and bonnet; do not tie them to the handwheel or valve stem to avoid damaging the valve stem and handwheel; 4) When installing valves on horizontal pipes, the valve stem must be vertical and upward; downward installation of the valve stem is not allowed; 5) When installing valves, forced alignment connections by pulling or dragging must not be used to avoid damage caused by uneven stress; 6) Rising stem gate valves should not be installed in underground damp locations to prevent valve stem corrosion.

Rieger valve troubleshooting

In certain pressure reduction control circuits, the outlet pressure of the pressure reducing valve is used to control the pressure level of control oil for electro-hydraulic directional valves or externally piloted sequence valves. After the electro-hydraulic directional valve or externally piloted 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 is zero, the flow passing through the pressure reduction port is only the pilot flow. Since the pilot flow is very small, generally within 2L/min, the main valve pressure reduction port is basically close to the fully closed position (extremely small opening). The pilot flow exits from the triangular groove or inclined conical surface. If the fit of the main spool is too loose or wear is excessive, leakage increases. According to the continuity equation of flow, this leakage must also come from the damping orifice of the main spool; that is, the flow through the damping orifice consists of two parts: pilot flow and leakage. Since the area of the damping orifice and the oil pressure in the main valve spring chamber remain unchanged (the spring chamber oil pressure is determined by the pre-compression amount of the adjusted pressure-regulating spring), an increase in flow through the damping orifice 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 spool fit.

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