SU1425405A1 - Bellows valve - Google Patents

Abstract

This invention relates to reinforcement. The aim of the invention is to increase the reliability of the valve by unloading the bellows from the action of high hydrostatic pressure. During operation, the hydrostatic pressure flows through the inlet channel 2 and acts on the bellows 5. The piston 10 installed in the stepped bore is under pressure in the force chamber 6 and the charge pressure chamber 7. As the operating pressure increases, the piston 10 moves up to the stop in step 8, releasing the spool 4 and increasing the volume of the power chamber. 2 Il.

Description

(L

Yu SP

The invention relates to reinforcement.

The purpose of the invention is to increase the reliability of the valve by unloading the bellows from high hydrostatic pressure.

FIG. 1 shows a valve under a predetermined pressure, section; FIG. 2 - the same, under the action of the working hydrostatic pressure, cf.

The valve includes a housing 1 with an inlet 2 and an outlet 3 channels, a spool 4, tightly connected to the force of the background 5, forming a force chamber 6 insulated from the working cavity filled with liquid, and a pressure loading chamber 7. Chambers 6 and 7 are connected by a stepped hole, and the step 8 of a smaller diameter is throttled. In the stage 9 of a larger diameter, located on the side of the chamber 6, a piston 10 is mounted. The mobility of the piston is limited on the one side by the spool, and on the other - by a step of smaller diameter. The charge of the chamber 6 with the liquid is produced without excessive pressure, with the piston 10 resting against the valve 4, and that is against the valve seat. When charging, a high gas pressure in the charging chamber 7 acts on the piston 10.. Since the piston rests on the spool (Fig. Oj, its movement and, consequently, the transfer of pressure to the power chamber is excluded.

During operation, an increase in the external hydrostatic pressure, flowing through the inlet channel 2 and acting on the snfon 5, causes a corresponding increase in the pressure of the fluid in chamber 6, since the fluid carried simulated, the bellows is elastic, and the chamber is sealed. The spool rests against the saddle until the resultant SI.P applied to the piston 10 from the pressures of charge 7 and force

0

5 0, 5 0

five

five

0

The howl of 6 chambers is directed to the slide or is equal to zero. A further increase in the external hydrostatic pressure leads to a change in the direction of the resultant forces, and the piston 10 moves up to the stop in step 8, freeing the valve and increasing the volume of chamber 6. As a result, the valve 4, not having an emphasis, under the action of external hydrostatic pressure moves up making a move until the increment in the volume of the sylphon chamber caused by the movement of the piston is compensated. In order that the slide valve does not receive an additional stop when it moves up, the distance between the surface of the slide that faces the bellows and the end surface of the intermediate chamber should be chosen larger than its working stroke. In this position, the bellows 5 is relieved by a high hydrostatic pressure, since any change in the external pressure results in a corresponding change in the pressure of the liquid inside the bellows chamber.

Claims (1)

Invention Formula A bellows valve, comprising a housing with inlet and outlet channels, a spool, tightly connected to the bellows, forming a force chamber isolated from the working cavity, filled with liquid, and a charging pressure chamber, the chambers communicating with each other by an opening reliability of work, the specified hole is made stepwise, a step of larger diameter is located on the side of the power chamber and a piston is installed in it, the mobility of which is limited on the one hand by the spool and on the other d - a step of smaller diameter. ////// l //////. N  N ///// t //////. f {/ g.2