Pneumatic diaphragm regulating valve

NegotiableUpdate on 05/20

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Overview

The pneumatic diaphragm regulating valve $r $n consists of two parts: an electric actuator or a pneumatic actuator and a regulating valve. Regulating valves are usually divided into two types: straight through single seat regulating valves and straight through double seat regulating valves. The latter has the characteristics of large flow capacity, small imbalance, and stable operation, so it is usually particularly suitable for situations with high flow rate, high pressure drop, and low leakage.

Product Details

Pneumatic diaphragm regulating valve

Regulating valve is a widely used type of final control component. Other final control components include metering pumps, regulating baffles and louvered baffles (a variant of butterfly valves), variable pitch fan blades, current regulating devices, and motor positioning devices different from valves. Although regulating valves are widely used, other units in the regulating system probably do not require as little maintenance work as it does. In many systems, the operating conditions such as temperature, pressure, corrosion and pollution that the regulating valve is subjected to are more serious than those of other components. However, when it controls the flow of process fluid, it must operate satisfactorily with minimum maintenance.

The regulating valve consists of an electric or pneumatic actuator and a regulating valve. Regulating valves are usually divided into two types: straight through single seat regulating valves and straight through double seat regulating valves. The latter has the characteristics of large flow capacity, small imbalance, and stable operation, so it is usually particularly suitable for situations with high flow rate, high pressure drop, and low leakage.

This classification method is divided into nine major categories based on principles, functions, and structures:

(1) Single seat regulating valve;

(2) Double seat regulating valve;

(3) Sleeve regulating valve;

(4) Angle regulating valve;

(5) Three way regulating valve;

(6) Diaphragm valve;

(7) Butterfly valve;

(8) Ball valve;

(9) Eccentric rotary valve. The first six are straight strokes, and the last three are angular strokes.

Pneumatic diaphragm regulating valve

Characteristics:

Equal percentage characteristic

The relative stroke and relative flow rate of the equal percentage characteristic are not linearly related. The change in flow rate caused by the change in unit stroke at each point of the stroke is proportional to the flow rate at that point, and the percentage of flow rate change is equal. So its advantage is that when the flow rate is small, the flow rate change is small, and when the flow rate is large, the flow rate change is large, which means it has the same adjustment accuracy at different opening degrees.

linear characteristic

The relative stroke and relative flow rate of linear characteristics are linearly related. The flow changes caused by changes in unit travel are constant. When the traffic is high, the relative value of the traffic changes slightly, while when the traffic is low, the relative value of the traffic changes greatly.

Parabolic characteristic

The flow rate varies proportionally to the two sides of the stroke, and generally exhibits intermediate characteristics of linearity and equal percentage.

From the analysis of the above three characteristics, it can be seen that in terms of its regulation performance, taking the equal percentage characteristic as *, its regulation is stable and its regulation performance is good. The parabolic characteristic has better regulation performance than the linear characteristic, and any flow characteristic can be selected according to the requirements of different usage scenarios.