Rexroth overflow valve zdb6vp2-42/315v

ZDB6VP2-42/315V The relief valve is a superimposed pilot relief valve , To limit system pressure , It is in the hydraulic system , There are two main uses .

1. Pressure stabilization and regulation . For example, it is used in the hydraulic source composed of quantitative pump , Adjust the outlet pressure of the pump , Keep it at a constant pressure .

2. Limiting pressure . If used as Rexroth overflow valve , When the system works normally, the overflow valve is closed , The overflow valve is opened only when the system pressure is greater than its regulating pressure , Protect the system from overload . To ensure safety , In the relief valve , Overflow valve can be used as a kind of safety valve , Except that the overflow valve is normally open 、 The safety valve is normally closed , On the structure , General safety valves are direct operated relief valves , To ensure safety .

Technical characteristics

• Superimposed structure

• 4 Pressure range .

• model ZDB6VP2-42/315V

• 5 Selectable effective flow direction .

• With one or two cartridge relief valves .

• 4 Adjustment elements .

The difference between the pilot type and the direct acting type

REXROTH There are two types of relief valves, direct acting and pilot operated . The direct acting relief valve is a relief valve that directly balances the hydraulic pressure acting on the main circuit of the valve core and the force of the pressure regulating spring . According to the structure of valve port and pressure measuring surface , There are three basic structures .

REXROTH Pilot relief valve ： The main valve spring mainly overcomes the friction of the valve body , The rigidity of the spring is small . When the change of overflow causes the change of the compression amount of the main valve spring , The force on the spring does not change much , Thus, the inlet pressure of the valve changes little . Accurate pressure regulation , Widely used in high voltage , High flow system .

The valve core of the overflow valve will be affected by friction during the movement , The friction force when the valve port is closed is in the opposite direction , Make the open characteristic of the overflow valve different from the closed characteristic .