What is a pilot operated safety valve and what is the opening height of the pilot operated safety va

A first-in-class valve and a direct-acting safety valve constitute a pilot-operated safety valve, and the ordinary direct-acting test is to rely on the hydraulic pressure to overcome the spring force to open to achieve the role of pressure relief protection. Pilot control valve you can understand as using hydraulic pressure instead of spring stress, although the direct core of the pilot control valve also has a spring, but the core of the direct part of the pilot safety valve is different from the ordinary, there is a small hole to discharge the hydraulic oil into the spring cavity, so that the upper and lower valve cores have the same pressure, but the pressure of the spring cavity also acts on the core of a pilot valve, the general pilot valve core area is small, so the opening pressure of the hydraulic oil is very large, When the pilot valve core is jacked up, the hydraulic oil of the spring chamber returns to the oil tank, and the pressure of the spring chamber also drops rapidly, which is the pressure difference that will quickly jack up the direct valve core and begin to relieve a large amount of pressure.

This principle of operation of the pilot safety valve allows it to be used in hydraulic equipment with higher pressures, and the main valve core has more accurate pressure control due to the fast opening and closing speed of the oil flow. (Since the simple direct action test is the spring is gradually jacked up as the pressure increases). In addition, because the pressure relief is controlled by the pilot valve, remote pressure control can be realized, that is to say, the pressure opened by the pilot valve is not the system pressure, but the external pressure control.

This is called remote pressure regulation control.

The picture is a cross-sectional view of the pilot-operated pressure reducing valve, and the pilot-operated valve part is the same. Let's deal with it!

The pilot-operated safety valve consists of two parts, namely the pilot valve and the main valve. The pilot valve can be regarded as an ordinary safety valve; The main valve is divided into two cavities, the upper and lower, and the spool is in the middle. The basic principle is:

Normally, the pressure of the upper and lower chambers is the same. Due to the action of the spring, the spool of the main valve is closed; When the inlet pressure of the safety valve reaches the setting pressure, the pilot valve jumps first to release the pressure of the upper cavity of the main valve, so that the valve core is quickly opened under the action of the lower pressure to achieve pressure relief protection.

The common characteristics of the pilot valve of the first infiltration shed are: 1) It forms a pilot control liquid bridge with the fixed liquid resistance, and the main valve or secondary valve or variable bar is controlled according to the input signal of the hail collapse; 2) The flow rate of the first pilot valve is generally only about 1 liter min, and the maximum is 3 litres. The flow rate of the secondary pilot valve should be determined according to the actual needs. 3) The input signals are relatively small; 4) It can accept a variety of input methods, such as manual, electric, hydraulic, pneumatic, mechanical cam, electric proportion, etc.; 5) In the case of variable pump control, a variety of pilot valves form a modular structure, and a variety of functions are convenient to trade-off; 6) The pilot valve itself is often a small-sized control valve, mostly a pressure control valve.

Hello, the opening stroke height of the pilot operated safety valve is: minimum discharge throat diameter); The opening height of the full-opening safety car valve is . The pilot-operated safety valve is a safety valve with a novel structure.

Mainly used in oil and gas, chemical industry, electric power, metallurgy and city gas and other fields, it is an overpressure protection device on pressure equipment, containers or pipelines. The main advantage of the pilot-operated safety car training valve is that the direct action of the spring is the indirect use of the pilot valve for closing the sail, which improves the sensitivity of the action, and the main valve adopts the sleeve piston type, double sealed valve seat structure, high action accuracy, good repeatability, fast return seat, no leakage, can be discharged with high back pressure, long work, stable and reliable work, the pilot safety valve can also be adjusted, after repeated start and jump discharge, it can still automatically return to the seat, close tightly, and easy to operate and maintain.

Pilot safety valve is a kind of safety protection valve, it is through the start and close of the small pilot valve to control the start and close of the main valve, when the medium pressure in the equipment or pipeline rises, it will be automatically opened when it exceeds the specified value, and the medium pressure in the pipeline or equipment can be prevented from exceeding the specified value by discharging the medium outside the system. The safety valve belongs to the class of automatic valve rental stove, which is mainly used in boilers, pressure vessels and pipelines, and the control pressure does not exceed the specified value, which plays an important role in protecting personal safety and equipment operation. According to the opening height of the disc of the safety valve, it can be divided into micro-open safety valve and full-open safety valve, and the opening stroke height of the micro-open safety valve is:

minimum discharge throat diameter); The opening height of the fully opened safety valve is the minimum discharge throat diameter).

Here are some 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, Chaoda, Shentong, Su Valve, Nanfang, Jiang.

First, the word Yao. The above manufacturers are only the role of estimation and banquet reference, 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 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 changing 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 opening and closing of the safety valve cannot and cannot be the same value; The difference between the two is too small, and it will form ** (repeated opening and closing) when the safety valve is opened. The difference between the two is too great, and the safety valve cannot be reset (closed) in time after the pressure is back.

A safety valve consisting of a main valve and a pilot valve, which is driven or controlled by the medium discharged from the pilot valve. The pilot valve itself is a direct-duty safety valve.

The pilot valve is used to control the medium pressure of the upper chamber, and the upper and lower pressure difference is used to control the main valve switch.

A pilot valve is an auxiliary valve used to operate the control mechanism in other valves or components. The pilot valve is composed of an electromagnet for wet valve, a valve core, a transmission plunger, a valve sleeve, a thimble rod, a steel ball, a steel ball seat, a return spring, etc. The spool of the hard-sealed butterfly valve is threaded to the valve body.

One end of the drive plunger is connected to the solenoid armature, and the other end is against the steel ball. Therefore, whether it is the thrust of the upper electromagnet or the force of the spring at the lower end, the two steel balls are linked to the thimble rod. There is a section of annular control cavity between the two ends of the ejector rod and the valve core, and is respectively communicated with the radial hole on the valve core.

This is a two-position, three-way, double-ball normally closed solenoid valve.

The pilot valve is composed of an electromagnet for wet valve, a valve core, a transmission plunger, a valve sleeve, a thimble rod, a steel ball, a steel ball seat, a return spring, etc. The spool is threaded to the body. One end of the drive plunger is connected to the solenoid armature, and the other end is against the steel ball.

Therefore, whether it is the thrust of the upper electromagnet or the force of the spring at the lower end, the two steel balls are linked to the thimble rod. There is a section of annular control cavity between the two ends of the ejector rod and the valve core, and is respectively communicated with the radial hole on the valve core. This is a two-position, three-way, double-ball normally closed solenoid valve.

When the electromagnet is de-energized, the pressure oil entering from the P cavity acts directly on the ball seat of the pilot valve, and the elastic force of the return spring also acts on the ball seat in the same direction, so that the lower valve port of the pilot valve is closed, and the upper valve port is opened, so that the pressure oil circuit and the control oil circuit A are blocked, and the control oil circuit and the return oil circuit T are opened. In this case, the control oil circuit is in an unloaded state; When the electromagnet is energized (dangdiancitiededianshi), the transmission plunger pushes the upper ball downward, the upper valve port closes, and the lower valve port opens. Therefore, the passage of the control oil circuit and the return oil circuit is blocked, and the pressure oil circuit and the control oil circuit are opened at the same time.

The pressure oil enters the oblique orifice of the valve body through the control cavity of the pilot valve, so that the control oil circuit is in working condition.

Pilot valve is very important in industrial production, what is its role? Today is a long time to see.