Spring type hydraulic driver

Abstract

The invention provides a spring type hydraulic driver. The spring type hydraulic driver is used for being arranged on a valve. The valve comprises a valve cover provided with an upper flange connecting part, and a valve rod. The spring type hydraulic driver comprises a driver shell, wherein a pull rod, a valve rod connecting rod and a compression spring are further arranged in the driver shell; the valve rod connecting rod is connected with the valve rod; a step is formed on the lower end face of the valve rod connecting rod; the driver shell is fixed on the upper flange connecting part; a rotating disk is further arranged on the valve cover; the center of the rotating disk is provided with a first guide hole; an adjusting nut which can only move up and down is arranged in the first guide hole; the adjusting nut is in threaded connection with a packing gland in the valve cover; a plurality of threaded connecting holes are distributed in the rotating disk; the upper flange connecting part of the valve cover is provided with an arc-shaped groove which is through from top to bottom; at least two threaded connecting holes are exposed out of the arc-shaped groove. The spring type hydraulic driver further comprises a locking part which can be connected with the threaded connecting holes after passing through the arc-shaped groove. The spring type hydraulic driver has the advantages of adjustable stroke and complete set installation.

Description

technical field [0001] The invention relates to a single-acting (spring-type) hydraulic driver, in particular to a spring-type hydraulic driver whose stroke can be adjusted outside the driver and which can be combined with an API 6A valve. Background technique [0002] Single-acting hydraulic actuators are mainly used in Christmas tree safety valves, choke manifolds, collection pipelines and other equipment. It is a control device that combines common use, large driving force, and uniform and stable operation. However, there are still many deficiencies and urgent improvements in this type of drive, among which problems such as non-vibration resistance (the threads of the multi-finger device are easy to loose after vibration), various types, and difficulty in stroke adjustment are more prominent. Specifically, the existing spring-type actuators for slab gate valves mainly have the following technical problems to be solved urgently. [0003] (1) In the prior art, the stroke o...

AI Technical Summary

Problems solved by technology

However, due to the uncertainty of the thread screw-in point, in order to align the hydraulic source oil circuit interface on the driver with the flow channel hole of the valve, usually the thread cannot be tightened, and only the set screw is used to prevent rotation.

Due to the limited space and the size of the main parts, the diameter of the set screw cannot be very large, which directly leads to its extremely limited anti-rotation effect; when the driver is pressed or transported, the thread load changes, the set screw will become loose, and its anti-rotation function At this time, the driver and the valve will rotate relative to each other under the action of vibration or external force, which will directly lead to the change of the valve stroke and cause adverse consequences

[0005] (3) In the prior art, the valve stem of the slab gate valve is threadedly connected to the valve stem connecting rod in the driver, and is equipped with a set screw to prevent rotation, which is similar to the case of the set screw anti-rotation emphasized in (2), During the application and test, the load on the thread between the valve stem and the valve stem connecting rod changes, causing the set screw to loosen, and the relative rotation between the valve stem and the valve stem connecting rod will also affect the stroke of the driver.

In addition, in many cases, the driver will be purchased as a whole or assembled with the valve, and the valve stem and the valve stem connecting rod should be fixed with set screws to prevent rotation, so the driver must be disassembled, resulting in duplication of labor

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