Structural requirements for thermocouples in Wuzhong instruments

Valve is a device used by Gongliang to control the direction, pressure and flow of fluid in the fluid system. A valve is a device that allows the flow or suspension of the medium (liquid, gas, powder) in the piping and equipment, and can control its flow. The valve is a controlling part in the pipeline fluid delivery system, ...

The actuator of the control valve has pneumatic type, electric type and electro-hydraulic linkage type, and the pneumatic equipment is divided into barrier type and cylinder type. Depending on the action when the operating signal and the drive source disappear, the actuator has a forward type, a reverse type, a non-directional type, and a persistent type. The positive type is used in the operation signal and drive ...

In the process control system, the control valve accepts the control signal of the control instrument, directly touches with the fluid, adjusts the flow of the fluid, and controls the flow, pressure, temperature, liquid level and other elements in the system, so it understands the fundamental structure and characteristics of the control valve, and selects it correctly according to the process conditions of the system. ...

The control valve, also known as the control valve, is a device in the field of industrial automation process control that uses power operation to change the process parameters such as the flow, pressure, temperature, and liquid level of the pipeline medium.

Scientific and technological innovation, Wuzhong Instrument has gone through a road of deep integration of informatization and industrialization. "There are too many foreign 'stuck neck' technical products. The control valve industry is all-encompassing, with 100,000 varieties and specifications, more than 1 million parts, and more than 5,000 quality control points.

Valves are control components in fluid transportation systems, which have the functions of shut-off, regulation, diversion, prevention of backflow, pressure stabilization, diversion or overflow pressure relief. Valves for fluid control systems, from the simplest shut-off valves to the most complex valves used in automated control systems, are available in a variety and size.

The flow rate and velocity of the valve mainly depend on the diameter of the valve, and are also related to the resistance of the structure of the valve to the medium, and at the same time have an intrinsic relationship with the pressure, temperature and concentration of the medium of the valve. Two...

The structure of the adjustable pressure reducing valve is composed of a main valve, a pressure feedback system, and a control pipeline. The main valve is composed of main parts such as valve body, diaphragm seat, valve cover, diaphragm, valve stem, valve plate, etc. The adjustable pressure reducing valve is installed on the one-way water supply pipeline in the city, which can reduce the upstream (inlet) pressure of the higher valve.

Valve application requirements (1) General gate valves, ball valves, and globe valves are prohibited from regulating according to their structural characteristics. However, in process design, it is widely used for mediation. Due to the conditioning application, the valve seal is in a throttling state for a long time, and the impurities in the oil wash the seal, damaging the seal.

1. The valve positioner is divided into pneumatic valve positioner, electrical valve positioner and intelligent valve positioner according to the input signal. (1) The input signal of the pneumatic valve positioner is a standardized gas signal, for example, the 20-100kPa gas signal, and its output signal is also a standardized gas signal. （ ...

There are two main reasons for the leakage of cryogenic valves, one is internal leakage; The second is leakage. 1) Internal leakage of the valve The main reason is the deformation of the sealing pair at low temperature. When the temperature of the medium drops to the point where the data undergoes a phase change, the volume changes ...

Valve is a kind of commonly used hardware products, the valve in the assembly and installation process also has a certain skill requirements, otherwise the assembled valve may not show its own excellent performance, what are the skill requirements of the valve in the assembly process? ...

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 ...

1. The sealing surface is uneven and cannot constitute a sealing line: 2. The connection between the valve stem and the closure is suspended, irregular or worn; 3. The valve stem is tortuous or the assembly is not correct, so that the closure is skewed or mismatched: Fourth, the sealing surface raw materials are not selected properly or not according to the working conditions.

The commonly used medium for valve pressure testing is water, oil, air, steam, nitrogen, etc., and the pressure testing methods of various valves are as follows. (1) Globe valve and throttle valve For the strength test of globe valve and throttle valve, the assembled valve is usually placed in the pressure test frame, the valve disc is opened, and the medium is injected into the ...

The normal operation of the appearance is inseparable from the protection of the site, especially some important process links, once there is a leak, it will greatly affect the quality of the product, resulting in heavy losses. First of all, on important tanks in general ...

The valve is a control component in the fluid transportation system, which has the functions of shut-off, conditioning, diversion, preventing backflow, stabilizing pressure, diverting or overflowing pressure relief. Valves for fluid control systems, from the simplest shut-off valves to the most chaotic valves used in automated control systems, range from ...

1. Elastic ball valve (i.e. orbital ball valve) The elastic ball valve is the orbital ball valve, and its ball is elastic. The ball and the seat seal ring are made of metal materials, and the specific pressure of the seal is very large, and the pressure of the medium itself can not meet the requirements of the seal, so it is necessary to apply external force. This...

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...

There are currently four types of actuators, which are capable of operating various types of valves with different driving forces. 1. Electric multi-reverse executive organization Electrically driven multi-reversal executive organizations are one of the most commonly used and reliable types of executive organizations. Wield...