LT7175B - HYDRAULIC OVERPRESSURE SAFETY VALVE - Google Patents

Abstract

The invention is intended to reduce vibrations occurring in a hydraulic safety overpressure valve due to various external factors, to reduce hydraulic fluid flow losses when the hydraulic safety overpressure valve body (1) is affected by external vibrations, and to increase the stability of the valve operation and the speed of reaction to pressure changes. The main element of the hydraulic safety overpressure valve is a vibration damping device fixedly mounted in the inner part of the valve body (1), which consists of a flexible damping disk (3) made of elastomeric material with drainage holes arranged in it, arranged around the vertical axis of the disk (3) at an angle β=360⁰n. The hydraulic safety overpressure valve can be used in various types of hydraulic systems, especially when external vibrations occur in the devices, for example, in mobile and heavy duty machinery and special vehicles. Due to the fact that the closing element (2) of the hydraulic safety overpressure valve is conical in shape and the valve has a fixed flexible damping disc (3) made of elastomeric material in the inner part of the body (1), the vibrations that occur in the hydraulic safety overpressure valve under the influence of various external factors are reduced, and fluid flow losses in the hydraulic system are reduced, since the valve does not open due to various external vibrations.

Description

FIELD OF THE INVENTION

The subject of the invention is a hydraulic safety overpressure valve intended for controlling various types of hydraulic systems, especially when external vibrations and, at the same time, pulsations of the hydraulic fluid occur in the devices, for example, in mobile and heavy duty machinery and special vehicles.

STATE OF THE ART

The hydraulic safety overflow valve described in Polish patent PL161518B1 has a housing with a threaded sleeve, a plunger, a spring and a connection with the valve seat. The spring is compressed by a threaded sleeve screwed into the housing from above, and the resistance to it is provided by a nut. The lower part of the piston is equipped with a closing element that stops the flow of hydraulic fluid through the valve seat. The upper part of the piston is equipped with a plunger on which the spring rests. The gaskets seal the threaded sleeve between the housing and the plunger, thus separating the housing chamber with the spring from the rest of the valve space filled with hydraulic fluid.

Lithuanian patent LT7122B describes a hydraulic safety valve with a vibration-damping closing system, which consists of a conical closing element and a sleeve located at different ends of the valve stem. A clamping spring presses the conical closing element against the valve seat and is simultaneously supported by a plate that fixes the position of the clamping spring inside the adjusting screw. The lower part of the stem is inseparably connected to the conical closing element, and the upper part has an external thread, on which a sleeve made of rubber or elastomeric material is placed. A nut and washer press the sleeve against the adjusting screw.

Polish patent PL221214B1 describes a hydraulic micro-max type valve having a housing inside which there is a main flow channel and a valve seat connected to it. The valve housing also includes a closing element and a spring pressing it. The closing element is supported by an adjusting screw having a drainage channel. The closing element of the valve has a damping disc with holes arranged in it, arranged around the circumference of the disc symmetrically with respect to its vertical axis. The damping disc is rigidly mounted on the throttle element and is made of metal.

ESSENCE OF THE INVENTION

The purpose of the invention is a hydraulic safety overpressure valve, the purpose of which is to reduce both vibrations occurring in the hydraulic system due to various external factors and hydraulic fluid flow losses.

In the used lift-type valves, the effect of external mechanical vibrations on the valve body and the effect of vibrations of the hydraulic fluid inside the valve on the valve closing element are known. When the direction of vibrations coincides with the axis of the valve closing element, the closing element also vibrates. This is due to the natural frequency and excitation of the closing element. It is known that mechanical vibrations acting on hydraulic valves cause vibrations of the closing elements. The vibrations are transmitted to the valve closing element mainly through the spring, which tightens the valve closing element. The vibrations acting on the valve closing element cause negative effects - unstable valve operation and pressure pulsations in the hydraulic system.

Other currently known hydraulic valves of various types usually have a housing, inside which there is a closing element - a ball, a needle or a pin, pressed by springs to the valve seat. In order to reduce vibrations of the closing element, it is installed in hydraulic valves together with additional damping devices. The main disadvantage of such a design is that due to additional damping devices the dimensions of the valve increase, and also the sensitivity and reaction speed of the valve to sudden changes in pressure decrease.

Based on this invention, a hydraulic safety overpressure valve has been created to eliminate the negative effects of vibrations during operation. The total energy loss during operation of the hydraulic safety overpressure valve is reduced by approximately 10% due to the reduction of hydraulic fluid flow losses.

The hydraulic pressure relief valve is intended for use in various types of hydraulic systems, especially when external vibrations occur in the equipment, for example, in mobile and heavy-duty machinery and special vehicles. Due to the fact that the valve closing element is conical in shape and the valve has a fixed flexible damping disc made of elastomeric material in the body, the vibrations occurring in both the valve itself and the hydraulic system are significantly reduced. The essence of the invention is a valve damping device - a flexible damping disc, which has drainage holes that allow the hydraulic fluid to fill the valve working chamber above the disc. The drainage holes in the disc allow the hydraulic fluid to flow freely between the chambers above and below the disc. The disc is fixedly mounted in the inner part of the body, is made of elastic material and therefore can deform elastically during operation. As a result, the valve operates stably and responds quickly to pressure changes.

The main advantage of a hydraulic relief valve is that it reduces vibrations caused by various external factors in the valve and that it reduces hydraulic fluid flow losses, since the valve does not open under the influence of external factors and vibrations. In this way, the stability of the operation of the hydraulic relief valve is achieved; vibrations of the valve closing element are reduced; hydraulic fluid pressure pulsations in the hydraulic system are reduced; the system's usefulness, reliability and efficiency are increased.

DESCRIPTION OF THE FIGURES Fig. Diagram of a hydraulic safety overpressure valve:

1. Valve body.

2. Conical closure element.

3. Flexible damping disc.

4. Adjustment screw.

5. Tension spring.

6. Plate.

7. Sealant.

Fig. Flexible damping disc with drainage holes arranged symmetrically around the vertical axis of the disc at an angle β = 360 STRUCTURE AND OPERATING PRINCIPLE

The subject of the invention is a hydraulic safety overpressure valve, shown in Fig. 1. The hydraulic safety overpressure valve consists of a housing (1) in which a conical closing element (2) is located. A clamping spring (5) presses the conical closing element (2) against the valve seat. The clamping spring (5) is supported by a plate (6) that fixes the position of the clamping spring (5) inside the adjusting screw (4). Between the conical closing element (2) and the clamping spring (5), a flexible damping disc (3) is fixedly mounted in the inner part of the valve housing (1). The flexible damping disc (3) is provided with drainage holes arranged around the vertical axis of the disc (3) at an angle β = 360- , as shown in Fig. 2. There is a seal (7) between the valve body (1) and the adjustment screw (4).

The operation of the hydraulic safety overpressure valve specified in the invention, having a flexible damping disc (3) with drainage holes provided, is described below. A flexible damping disc (3) is fixedly mounted in the inner part of the hydraulic safety overpressure valve body (1), in which drainage holes are provided to allow the hydraulic fluid to fill the working valve chambers located above and below the disc (3). Since the flexible damping disc (3) is fixedly mounted in the inner part of the valve body (1), is made of an elastomeric (non-metallic) material and is equally exposed to the pressure created by the hydraulic fluid on both sides, therefore, during operation, when the conical closing element (2) moves, the flexible damping disc (3) deforms elastically, thus creating a damping force acting on the conical closing element (2). As a result, the hydraulic pressure relief valve does not open due to various operating vibrations, operates stably and responds quickly to pressure changes.

Claims (3)

1. A hydraulic overpressure safety valve is designed to control various types of hydraulic systems, having an adjusting screw, a clamping spring, a conical closing element and a plate, characterized in that it has a housing in the inner part of which a flexible damping disc is fixedly mounted. 2. A hydraulic overpressure safety valve according to claim 1, characterized in that drainage holes are arranged in the flexible damping disk symmetrically around the vertical axis of the disk, at an angle β = 360-. 3. A hydraulic overpressure safety valve according to claims 1-2, characterized in that the flexible damping disc, in which drainage holes are provided, is made of a hydraulic fluid-resistant and vibration-damping elastomeric material.