Process parameters to be provided for the selection of control valves

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 ...

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 floating valve seat, when the valve is in two different states, fully open and fully closed, the fluid is ...

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, ...

Generally, the selection of control valve is mainly based on the nature of the medium, process parameters, use requirements, etc. 1. The properties of the medium should be clearly attributed to which of the following: (1) General fluids (2) High viscosity, fluids containing suspended solids, fibrous and other fluids (3) Toxic or high...

Nowadays, the valve market is mixed, and illegal traders pretend to be innovative valves to be shoddy in order to make huge profits, which brings great safety risks to the installation project. Therefore, it is necessary to introduce to you the inspection of innovative valves. At present, the valve market dealers mainly exist in the valve counterfeiting ...

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 ...

1. The valve position of the electric actuator is lost: 1) Battery power is lost When the incremental encoder is selected to measure the stroke, it is necessary for the fulfillment mechanism to have a battery as an auxiliary power supply, the AC power supply disappears, and the change of the valve position of the electric actuator can still be detected by the incremental encoder.

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.

　　Technical characteristics of single eccentric sealed butterfly valve In order to solve the extrusion problem of the butterfly plate and the valve seat of the concentric butterfly valve, a single eccentric butterfly valve is produced, and its structural characteristics are that the shaft of the valve stem deviates from the center of the butterfly plate, so that the upper and lower ends of the butterfly plate are not ...

In the process of use, several problems are usually presented in the direction of (FO, FC, FL), and the "fault" in the valve fault closing/obstacle opening refers to: the action of the valve when the gas source is gone. For the fault location of pneumatic valves, it is mainly divided into several situations: ...

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; ...

1. Pole change speed regulation This speed regulation method is to change the number of stator pole pairs of the cage motor to achieve the speed regulation intention by changing the wiring method of the stator winding, and the characteristics are as follows: it has hard mechanical characteristics and good stability; No slip loss, high power; The wiring is simple, the operation is convenient, and the price is ...

The filter is an indispensable product in the fluid pipeline, which is generally installed at the inlet end of the pressure relief valve, pressure reducing valve and water level valve set equipment, which has the effect of eliminating impurities in the medium and avoiding the phenomenon of other equipment being stuck. After the medium passes through the filter cartridge equipped with a certain standard screen, the impurities are blocked.

The angular displacement of the valve position detected by the valve limit switch box changes the transmission shaft through the coaxial adjacency or the reaction rod, so that the cam touches the miniature switch, so that the contact of the switch assembly is closed or disconnected, and the switching signal is transmitted to the outside through the terminal, and the passer is displayed on the spot. ...

First, there is a leak in the safety valve. The industry said that when there is a small leakage in the safety valve, it is generally not easy to find, but even a small leakage point will expand in the erosion. The test method is to test ...

(1) The sealing pair is spherical, disc bias reversal planning The valve sealing pair is spherical and has a good sealing effect. 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 constitute a sealing effect of the bias cam wedge when closed, and the valve ...

Cryogenic valves are mainly used in ethylene, liquefied natural gas equipment, air separation equipment, petrochemical tail gas separation equipment, liquid oxygen, liquid nitrogen, liquid argon, carbon dioxide cryogenic storage tanks and tankers, pressure swing adsorption oxygen production and other equipment, the main varieties are cryogenic ball valves, cryogenic globe valves, etc. ...

1. Leakage of stuffing box This is the primary aspect of running, running, dripping and leaking, which is often seen in the factory. There are several reasons why stuffing box leaks occur: (1) The corrosiveness, temperature and pressure of the filler and the working medium are not suitable; (2) The filling method is wrong, especially the whole filler ...

(1) Carefully check whether the valve type and specifications meet the requirements of the drawings. (2) Check whether the valve stem and disc are sensitively open, and whether there is any jamming and skewing. (3) Check whether the valve is damaged, and whether the thread of the threaded valve is correct and complete. (4) Check the valve ...

The process of shell experiments and seal experiments done by turbine fixed ball valves in some artificial environments is as follows. 1. The double blocking and discharge function of the turbine fixed ball valve: the turbine ball valve is fixed by using the tension spring preload floating valve seat, when the valve is in two different states of full open and fully closed, the flow ...