SU369326A1 - PRESSURE VALVE - Google Patents

Description

one

This invention relates to IK safety valves and anti-slip valves for hydraulic hydraulic actuators.

Known high-end “service valves” containing a main valve and an auxiliary valve-sensor connected to a pressure line through a jet in the shut-off organ of the main valve.

The proposed pressure valve differs from those known in that a choke, for example a washer, with a calibrated orifice is installed in the drain channel of the main valve, and the auxiliary valve-sensor is equipped with an additional reciprocating piston kosher connecting the valve to the drain cavity of the main valve.

This allows the pressure drop at the valve to become leon when the flow rate of the working fluid rises; otsi1 through an additional increase in flow through the auxiliary valve-sensor.

In the drawing, the described pressure valve is sectionalized.

A main valve with a shut-off organ 2 is located in the housing / is equipped with an actuator 5, which communicates cavity A of HIGH pressure with cavity B, which, in turn, is connected by channel with cavity B of the pilot valve-sensor. Auxiliary valve-sensor: has a piston 4 with a spring of 5. In the piston

there are holes 6 for the passage of the working fluid from the cavity to the cavity G, connected by a channel 7 to the drain. The auxiliary sensor valve is provided with an additional pore chamber 8 connected by a channel 9 to the cavity D of the main valve, in the drain box of which a throttle 10 is installed, for example a washer with a calibrated orifice.

With increasing pressure in the hydraulic system, and consequently, in the cavity A of the valve, the pressure rises in the cavity B of the auxiliary valve sensor.

The piston 4 moves and opens the passage of fluid through the openings 6 into the cavity G and the drainage l: inlet behind the throttle 10. The pressure drop on the nozzle 3 moves the valve 2, overcoming the spring force // and together the cavity A with the discharge cavity D. The working fluid flows through choke 10 to PLU. The differential pressure on the throttle 10, proportional to the flow rate through it, increases and is fed through the channel 9 into the piston chamber 8, additionally raising the piston 4.

The flow of fluid through the auxiliary valve sensor increases, and the stop valve 2 of the main valve additionally rises, increasing the flow of fluid into the cavity D. When the pressure drops into the cavity A, the flow of fluid through the cavity D decreases.

the throttle 10, the pressure in the additional piston chamber drops, and the piston 4 covers the passage of fluid from CAVITY C into cavity D, and follower H0, the flow rate of fluid from cavity A decreases in cavity B.

The intermediary body 2 opoukaets and closes the main gate through passage section. The pressure in the cavity of L | rises.

Subject invention

Pressure "laoan servo containing the main valve and auxiliary

A sensor valve connected to the pressure line through the jet in the shut-off valve of the main valve, characterized in that, with a drop in the differential pressure drop and an increase in the flow rate of the working fluid, a choke is installed in the drain valve of the main valve, for example a washer with a calibrated orifice, and the auxiliary valve The sensor is equipped with an additional piston chamber connected by a channel with the cavity of the main valve.