HAWE proportional relief valve PMV and PMVP types

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HAWE pressure valve from Germany
Proportional overflow valve
PMV and PMVP types
PMVS and PMVPS models (with imported oil control)
HAWE proportional relief valve PMV and PMVP typesOverview
PMV (S) and PMVP (S) proportional relief valves can achieve electrical proportional regulation of system pressure in hydraulic circuits. Obviously, in the event of a power outage, the system will be at its lowest pressure. This pressure value depends on the flow rate (flow resistance pressure drop) or the minimum value set by adjusting the screw. The characteristic of PMV (P) S type is that the control oil is externally controlled and separated from the main oil circuit (about 200 bar). The applications of HAWE pressure valves in Germany mainly include:; Used in high-pressure systems to improve the lifespan of pressure control devices. Used in very low pressure (0-5 bar) situations, it can help control the adjustability of pressure holding valves. Used in the main circuit of high-pressure systems, it can maintain pressure for a long time without loss of control oil. However, this proportional valve, which is controlled by a three-way proportional pressure reducing valve, does not experience such loss of control oil during normal operation (except during the adjustment process). The HAWE pressure valve control circuit in Germany requires a control flow rate of approximately 1 L/min, and the control oil will be controlled by, for example; A separate pressure outlet is provided for the radial piston pump, which must comply with the requirements of D6010S. This type of valve requires a proportional amplifier for control.
HAWE proportional relief valve PMV and PMVP typesIntroduction
PMV (P) and PMV (P) S-type valves are direct acting proportional relief valves, which consist of a main valve (ball valve, spring, control plunger) and a proportional control component (proportional relief valve, and primary relief valve) directly installed on the main valve.
The system pressure taken out from the inlet P of the main valve or the control oil pressure introduced through a separate control pressure port S provides the required lower constant inlet pressure for the three-way pressure reducing valve at the primary pressure reducing valve. The proportional pressure reducing valve converts this constant pressure into an electric proportional control pressure, which is then applied to the control plunger. This plunger acts on the valve through a compression spring to obtain the system pressure at the inlet P. The specifications of the proportional pressure reducing valve and the main valve determine different pressure ranges.
The pre tension force of the spring is adjusted by adjusting the screw, so that the allowable proportional adjustable pressure range starts from the lower limit pmin of about 3bar. When the control current is lower than the starting current, or even reversed to zero amperes, the maximum low pressure value will still remain constant, although the flow rate may vary.
For the function of the PMV (P) type proportional pressure reducing valve, a minimum pressure of 3bar or higher is required.
Specifications and main technical parameters of HAWE pressure valves supplied by Germany:
Example of ordering; PMV63-41/24
Next, we will introduce the working principle of the pressure valve:
Working principle of pressure regulating valve:
By receiving signals from industrial automation control systems (such as 4-20mA), the valve is driven to change the cross-sectional area between the valve core and seat to control process parameters such as flow rate, temperature, and pressure of the pipeline medium. Implement automated adjustment function.
HAWE pressure valve structure from Germany
Self operated pressure regulating valves, which do not require other external energy sources such as power and gas sources, rely solely on the energy of the medium itself to drive, are energy-saving, environmentally friendly, and easy to use. After installation, the pressure value can be set and put into automatic operation. Therefore, in situations where control accuracy is not high and there is a lack of power and gas sources, they have been increasingly widely used. But in the process of use, it is important to pay attention to the specificity of the selection, otherwise accidents may occur. During use, attention should be paid to the selection and installation environment. Therefore, it is very important to have a detailed understanding of the working principle and structure of the self operated pressure regulating valve.
Application of HAWE pressure valve in Germany
Self operated pressure regulating valve (hereinafter referred to as pressure valve) is an energy-saving product that does not require external energy and relies solely on the pressure changes of the regulating medium itself to automatically regulate pressure It has comprehensive functions of measurement, execution, and control. Widely applicable to industrial sectors such as petroleum, chemical, metallurgical, and light industry, as well as urban heating and heating systems. This product can be used as a pressure control device for non corrosive media such as liquids, gases, and vapors at a high temperature of 350 ℃.