1. Pneumatic valves include conditioning valves and blocking valves, the effect of the two is different, although the flow rate of the conditioning valve can also be adjusted to 0, but the blocking valve is generally used for urgent blocking, and the valve positioner is generally a cylinder valve. The conditioning valve is with a pneumatic membrane and a large disc, in addition to being able to ...

In the field of industrial automation process control, the conditioning valve, also known as the control valve, is the final control element that changes the process parameters such as medium flow, pressure, temperature, and wave level by means of dynamic operation by bearing the control signal output by the conditioning control unit. It is generally composed of a drive actuator and a valve ...

Valves often present some troublesome problems in the process of use, such as the valve is not closed tightly, not tight, so what should I do? Under normal circumstances, if it is not tightly closed, first admit whether the valve is closed in place, if it has been closed in place, it still exists.

Features of Gate Valve: Light weight: The body is made of high-grade ductile iron, and the weight is about 20%-30% less than that of the traditional gate valve, and the device is easy to repair. Flat-bottomed gate seat: The traditional gate valve is often washed by water and the pipe is due to foreign objects such as stone, wood, cement, iron filings, etc.

1. Smooth mechanism Smoothing is to add a smoothing agent between the two conflict surfaces of relative motion, so that a smooth film is formed between the two conflict surfaces, and the dry conflict appearance that is originally directly touched is separated, and the dry conflict is a conflict between the smooth agent molecules, so as to reduce the conflict and reduce wear, ...

When using stainless steel multistage pumps, it is first necessary to confirm the usefulness and functional parameters of the multistage pump and select the pump type. Criteria and basis for the selection of multistage pumps: 1. Make the type and function of the selected multistage pump fit the process parameters such as flow, head, pressure, temperature, NPSH, suction stroke, etc.

From the perspective of product application, hard seal ball valve defects can be roughly divided into the following two categories: non-technical faults and skill defects. The following text mainly introduces the analysis and solution of non-technical problems of hard seal ball valves; ...

Pneumatic control valve is one of the instruments widely used in petrochemical enterprises. It is of great significance to ensure the normal operation and safe production of the process equipment by operating accurately and normally. Therefore, it is necessary to strengthen the maintenance of pneumatic control valves. First, the key points to check the location during maintenance ...

(1) The conditioning valve does not operate. The symptoms and causes are as follows: 1. No signal, no air source. (1) The air source is not opened, (2) because the water contained in the air source freezes in winter, resulting in the blockage of the air duct or the blockage of the filter and pressure reducing valve, (3) the compressor is faulty; (4) Leakage of air source main pipe. 2． ...

The process of shell experiments and seal experiments done by turbine fixed ball valves in some artificial environments is as follows. Double blocking and discharge function of turbine fixed ball valve: the turbine ball valve is fixed by using tension spring preload float valve seat, when the valve is in two different states, full open and fully closed, the fluid is ...

(1) Thread damage due to excessive operation; (2) lack of lubrication or lubricant failure; (3) Stem bending and torsion; (4) The surface finish is not good; (5) Cooperative public service is forbidden and bites too tightly; (6) The stem nut is skewed; (7) Improper selection of information, such as valve stem and ...

The shut-off valve is a kind of actuator in the automation system, which is composed of a multi-tension spring pneumatic membrane actuator or a floating piston actuator and a regulating valve, which receives the signal of the regulating instrument and controls the blocking, switching or switching of the fluid in the process pipeline. It has a simple structure, sensitive response, and ...

Knife gate valve is a kind of valve, which is called knife gate valve because of its different structure. It has outstanding circularity through the use of some special media, such as some viscous media, granular media, etc. It solves some of the problems of modern equipment and becomes an indispensable component of modern equipment ...

Load the organization The role of the loading tissue is to apply a downward loading force from the top of the pressure reducing valve. The loading structure of the FITOK pressure reducing valve is mainly the loading of tension springs. Tension spring loading has the advantage of reliability and low cost, and is the most versatile loading device in pressure reducing valves.

1. The signal valve pushed by the control box does not move. Under the condition that the positioner is installed, the pneumatically adjustable butterfly valve is equipped with a solenoid valve. The weak current of the solenoid valve affects the information output of the control box, and the valve cannot withstand the data signal and cannot work normally. ...

It is composed of a pneumatic O-type shut-off ball valve and a pneumatic double-acting actuator. It has the advantages of simple structure, small size, light weight, convenient operation, etc., and can be widely used in automatic conditioning and long-distance control of industrial production processes such as petroleum, chemical industry, hydropower, and textile. ...

The active circulation valve is a pump protection device. It actively protects the centrifugal pump (especially the hot water medium) from partial cavitation damage and instability that may occur in the pump body when operating at low load. Once the pump flow rate falls below the preset flow, the bypass is completely opened to ensure that the pump needs a small flow rate. Namely...

(1) The sealing pair is spherical, disc eccentricity rotation planning The valve sealing pair is spherical planning, and the sealing effect is good. Together with the disc rotation center is planned to have a bias with the center of the valve seat, so the valve disc and the valve seat form a bias cam wedge sealing effect when closed, the valve ...

From simple shut-off valves to a wide range of valves in very complex automatic control systems, the varieties and standards are very complex. The valve can be used to control the activities of various types of fluids such as air, water, steam, various corrosive media, oil, liquid metal and other media. It is understood that from 2015 to 2018, ...

Pneumatic butterfly valves are usually composed of a combination of pneumatic actuators and valve bodies and some accessories after debugging. This article first introduces the precautions for the on-site application of pneumatic butterfly valves. 1. The control cabinet sends a signal that the valve does not move, and the pneumatic conditioning butterfly valve is in the device locator after on-site investigation.

1. Units and scales (scales) The scale (scale) unit of the temperature gauge is the Celsius temperature (°C). 2. Detect (measure) the penetration length of the element The length of the penetration should be selected in such a way as to insert the detection (test) element ...