Explanation of the working principle of hydraulic control valves

As the name suggests, a hydraulic control valve is a type of valve that is controlled by water pressure.

The composition of the hydraulic control valve mainly has a main valve and attached pilot valves, needle valves, ball valves and pressure gauges, etc., which can be divided into many types according to the different purposes and functions of use, such as pressure reducing valves, remote control float valves, etc. Generally, a filter must be installed in front of the hydraulic control valve to facilitate sewage discharge, so how does the hydraulic control valve work? Let's take a look at how it works.

Working principle of hydraulic control valve:

The water conservancy control valve is a valve that is used to open and close and adjust the pressure of the pipeline medium. It is composed of a main valve and attached conduit, needle valve, ball valve and pressure gauge, etc., according to the purpose of use, different functional places, can evolve into remote control float valve, pressure reducing valve, slow closing check valve, flow controller, pressure relief valve, hydraulic electric control valve, emergency shut-off valve, etc.

The pilot valve acts with the change of liquid level and pressure of the medium, because there are many types of pilot valves, it can be used alone or several combinations, so that the main valve can obtain the function of individual and compound adjustment of water level, water pressure and flow. But the main valve body is similar to the globe valve, when the valve is fully open, its pressure loss is much greater than other valves, and the closer the opening loss coefficient is to the fully closed state, the more sharply it increases, and the larger the valve diameter, the more significant.

The valve with the above characteristics is prone to the impact of water hammer when the action of the valve disc is accelerated, and when it is close to full closure, the slower the valve action, the better, so the throttling device can be set on the valve disc. In addition, the throttling and action part of the pilot valve should be avoided as much as possible to avoid setting up extra-small diameter orifice, so as not to block. If necessary, add a filter screen, regularly overhaul and set up a bypass pipeline.

There are two types of hydraulic control valves, diaphragm type and piston type, the working principle is the same, both are powered by the pressure difference between the upstream and downstream, and there is a pilot valve control, so that the diaphragm (piston) hydraulic differential operation is completely automatically adjusted by hydraulic power, so that the main valve disc is completely open or completely closed or in an adjusted state.

When the pressure water entering the control chamber above the diaphragm (piston) is discharged to the atmosphere or the downstream low pressure area, the pressure value acting on the lower part of the valve disc and below the diaphragm is greater than the pressure value above, so as to push the main valve disc to the fully open position: when the pressure value entering the control chamber above the diaphragm (piston) is in the middle of the inlet pressure and the outlet, the main valve disc is in the state of adjustment, and its adjustment position depends on the joint control effect of the needle valve and the pilot valve in the conduit system.

The pilot valve can open or close its own small valve port by changing the downstream pressure, thereby changing the pressure value of the control chamber above the diaphragm (piston) and controlling the adjustment position of the main valve disc. It can be used for domestic water supply, fire protection system and industrial water supply system.

The working principle of the hydraulic control valve has been introduced in detail for you, and I hope you can gain something by understanding the working principle of the hydraulic control valve, and it is easier to master its operation and use. Although hydraulic control valves are not common in daily life, they are closely related to life, especially in the water supply system of domestic water, so we should master the knowledge of hydraulic control valves in life.

Here are some of the well-known brands recognized in the valve industry, which are widely recognized and have a high reputation. While rankings may vary depending on time and market conditions, the following brands are generally considered to be among the top brands in the valve industry:

The following influential first-line brands of water system valves and industrial valves can be used as a reference, but for reference only: Suzhou Neway Valve, Shanghai Guanlong Valve, Shanghai Qizhong Valve, Sanhua, Su Yan, Shentong, Su Valve, Nanfang, Jiang.

First, the word Yao. The above manufacturers are only estimates and references, and the specific situation may vary or fluctuate at any time due to changes in a series of factors such as changes in the market, the size of the competition pattern, and the stability of product quality. As an indispensable key device in industrial production and civil facilities, the quality and reputation of the valve brand directly affect the satisfaction and trust of users.

These brands are known in the valve industry for their innovative technology, high-quality products and reliability. It is important to note that the market and industry are evolving rapidly, and different rankings may vary depending on time and region. For the most up-to-date ranking information, it is recommended to refer to industry reports, professional organizations or market research data for more detailed and accurate information.

The principle of the hydraulic water level control valve is that when the water level in the pool or water tower drops, the float valve opens and drains, there is pressurized water in the water inlet pipe to hold up the piston in the valve, the sealing surface is opened, the valve is opened for water supply, when the water level rises to the control valve, the float valve is closed, the piston moves down to close the sealing surface, and the valve stops water supply.

Hydraulic water level control valves are also known as water level control valves. The hydraulic water level control valve has the function of automatically opening and closing the pipeline to control the water level, which is suitable for the automatic water supply system of various water towers (pools) in industrial and mining enterprises and civil buildings, and can be used as the circulating water supply control valve of atmospheric boilers.

The hydraulic water level control valve is small in size, easy to install, high in activation sensitivity, small in head loss, and no water hammer.

Because the small float control can greatly improve the utilization rate of the water tower, for the new water tower due to the reduction of the float volume and the upper part of the water tower is left to the float to float freely, the required height is reduced, the cost of the water tower is reduced, and the old-fashioned rod float ring valve is overcome, such as large volume, easy damage, low working pressure, a large amount of overflow, etc., which is the most ideal and suitable product for the new water tower and the replacement of the old float valve.

The adjustment method of the hydraulic control valve is as follows:

Installation and commissioning of multi-function hydraulic control valve - Before the installation of multi-function hydraulic control valve, first of all, check whether the main valve is in good condition, the fasteners should not be loose, and whether the accessories are complete.

At the same time, it should be installed according to the installation diagram of the multi-function control valve. It is necessary to pay attention to the position of the control pipeline access to the main valve and the working status of the valve on the pipeline.

Hydraulic Control Valve Principle:

The hydraulic control valve is a valve that opens, closes and adjusts the pressure of the pipeline medium. It consists of a main valve and attached conduits, needle valves, ball valves and pressure gauges.

According to the different purposes and functional places of use, it can evolve into remote control float valves, pressure reducing valves, slow-closing check digging or valves, flow controllers, pressure relief valves, hydraulic electric control valves, emergency shut-off valves, etc. The pilot valve acts with the change of the liquid level and pressure of the medium, because there are many types of pilot valves, it can be used alone or several combinations, so that the main valve can obtain the function of individual and compound adjustment of water pressure and flow rate.

However, the main valve body is similar to the globe valve, and the pressure loss is much larger than that of other valves when the valve ruler is fully open, and the closer the opening loss coefficient is to the fully enclosed state, the more sharply it increases, and the larger the valve diameter, the more significant. <>

1. The principle of self-operated control valve is to rely on the pressure and temperature of the medium cavity flowing through the valve to drive the valve to work automatically without external power supply and secondary instrument.

2. This kind of self-operated control valve uses the feedback signal (pressure, pressure difference, temperature) at the output end of the valve to be transmitted to the execution of the leather talk mechanism through the signal tube to drive the valve to change the opening of the valve, so as to achieve the purpose of adjusting the pressure, flow rate and temperature.