SU450927A1 - Emergency valve - Google Patents

Description

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: The device relates to the elements of hydraulic actuators and can be used, for example, in pumping equipment.

Valve devices are known in which the closure member has an axial channel retracted into the pressure chamber. The locking member is controlled by a piston separating the drain chamber and the command pressure chamber.

The proposed device is different

from the known fact that the piston is mounted movably on the valve body, ax. The duct is made deaf and is connected to the command pressure chamber by a radial normally closed channel opened by the piston under the action of a controlled pressure.

This increases the sensitivity of the valve.

1 Dryness of the device is illustrated by a drawing.

In the case 1 of the emergency valve, closed by a lid, there is a cylindrical locking member 2 on which piston 3 is seated. Moving the piston upward is limited by means of a nut 4. The piston 3 is pressed to the nut 4 by means of a spring 5 and has the ability of elastic movement relative to the locking organ 2 Axial and radial channels 6 are made in the closure body 2, which, when the piston 3 is displaced relative to the closure body 2, have a pressure connection 7 with a cavity 8 formed by the inner surface of the valve body 1 and the end of the piston. The cavity 8 through the opening 9 and the check valve Yu is connected to the cavity of the controlled pressure. The cavity 8 can be connected for unloading with a drain, for which the valve 11 is presupposed. Between the locking member 2 and the valve body 1 there is a seal 12, and between the case 1 and the pressure connection 7 - a seal 13. The cavity 14 formed by the outer surface of the locking member 2, the inner surface of the valve body 1 and the end face of the piston 3 are permanently connected to the drain.

The device works as follows.

With an increase in the monitored distance over the set value, the force acting on pin 3 increases. Under the action of this pin no 3 pin 3, overcoming the resistance of the spring 5, moves relative to the stop pliers 2 up to the stop. When the atom is open, the channels 6 and the pressure nozzle 7 are connected through the channels 6 with a cavity 1-8, as a result of which the working fluid under high pressure enters the cavity 8. The force on the piston 3 sharply increases, causing the locking member 2 and piston 3 to move as one piece downwards At the end of the working stroke, the locking member 2 closes the pressure connection. To return the valve body 2 and the piston 3 to the original slide, a valve is opened.

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Subject invention

An emergency valve with a shut-off element, made in the form of a cylindrical body having an axial channel, led into the chamber of adjustable pressure, with an elastically mounted control piston separating the drain chamber from the command pressure chamber,. and in order to increase the sensitivity of the valve, the piston is mounted movably on the shut-off organ and is connected elastically with it, the axial channel is made deaf and connected to the command pressure chamber by a radial normally closed channel opened by the piston under the action of controlled pressure.