Can pneumatic globe valves and pneumatic control valves be wrapped in film in daily use 10

Here are some of the 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, Su Yan, Shentong, Su Valve, Nanfang, Jiang.

First, the word Yao. The above manufacturers are only estimates and references, 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 valve 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 evolving 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.

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The basic purpose of installing a bypass valve on a pneumatic diaphragm control valve is to keep production going in the event of a problem with the control valve. Therefore, if the device can be stopped for maintenance at any time, it is not necessary to install a bypass, but on the contrary, it must be installed.

In addition, when the flow capacity of the control valve is insufficient, it can be supplemented by a bypass, although any regulation theory is not in favor of this (it will seriously reduce the quality of the regulation), but it is a stopgap measure.

Therefore, whether the bypass valve needs to be irrelevant to the adjustment scheme, the key point is to consider the need for maintenance.

The standard control valve installation is with shut-off valves at both ends and bypass valves from the outside of the shut-off valve.

Yes. Added:

Control valves are the most widely used type of final control element. The final control elements include a metering pump, adjusting baffles and louvered baffles (a variant of the butterfly valve), fan blades with variable inclination, current regulation, and motor positioning devices that differ from valves. Despite the widespread use of control valves, none of the other units in the control system require as much maintenance.

In a multi-system of permits, the control valve is subjected to more severe operating conditions such as temperature, pressure, corrosion and contamination than the rest of the components, however, when controlling the flow of process fluids, it must operate satisfactorily with minimal maintenance.

The control valve is composed of two parts: electric actuator or pneumatic actuator and control valve. The control valve is usually divided into two types: straight-through single-seat control valve and straight-through double-seat control valve, the latter has the characteristics of large flow capacity, small unbalance and stable operation, so it is usually especially suitable for occasions with large flow, high pressure drop and less leakage.

The development of pneumatic diaphragm control valve has a history of 80 years since the beginning of the 20th century, and has successively produced ten categories of control valve products, self-operated valves and positioners.

Diaphragm material Operating temperature ( ) Applicable medium Butafen glue (grade B) -40 +100 Inorganic acids such as: sulfuric acid, hydrofluoric acid, phosphoric acid, etc. Alkali and salts Natural rubber (Q grade) -50 +100 Mainly used for Wuyefan purification of water, inorganic salts and alkene mineral acid cavity hail medium PTFE -10 +150 Excellent chemical stability, resistance to strong acids, concentrated alkalis, and strong oxidants.

It is classified according to the use and function, main parameters, pressure, medium operating temperature, special purpose (i.e., special, special valve), driving energy, structure, etc., among which the most commonly used classification method is to divide the control valve into nine categories according to the structure, 6 types are linear stroke, and 3 types are angular stroke. a；

b.。When selecting a valve, it is necessary to determine the flow characteristics of the regulating valve;

c.Diverter valves: used for dispensing or mixing media;

d.Shut-off valve: Usually refers to a valve with a leakage rate of less than 1 in 100,000. 1 Classification by pressure.

2) Low pressure valve: nominal pressure pn;

3) Medium pressure valve:;

4) High pressure valve: usually PN22, PN32;

5) Ultra high pressure valve: PN IOOMPA.

2 Classified by medium operating temperature.

1) High temperature valve: T>450;

2) Medium temperature valve: 220 t 450;

3) Normal temperature valve: 40 t 220; Cryogenic valve: 200 t 40. This classification method is divided according to principle, function and structure, and is currently the most commonly used classification method at home and abroad. It is generally divided into nine categories:

1) Single-seat control valve;

2) Double-seat control valve;

3) sleeve control valve;

4) Angle control valve;

5) Three-way control valve;

6) Diaphragm valve;

7) Butterfly valve; 8) Ball valve;

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

These nine products are also the most basic products, also known as normal products, base products, or standard products. All kinds of special products and special products are improved and varied on the basis of these nine types of products.

It is divided into main special purposes (i.e., special, special valves).

1) Soft seal shut-off valve;

2) Hard seal shut-off valve;

3) Wear-resistant regulating valve;

4) Corrosion-resistant control valve;

5) Full PTFE corrosion-resistant control valve.

6) Full corrosion-resistant alloy control valve;

7) Emergency action shut-off or venting valve;

8) Anti-clogging control valve;

9) Corrosion-resistant and anti-blocking shut-off valve;

10) Insulation jacket valve;

11) Large pressure drop shut-off valve;

12) Small flow control valve;

13) Large-diameter control valve;

14) Large adjustable ratio control valve;

15) Low S energy-saving control valve;

16) Low noise valve;

17) Compact control valve;

18) Lined (rubber, PTFE, ceramic) control valves;

19) Special ball valve for water treatment;

20) Caustic soda special valve;

21) Ammonium phosphate valve;

22) chlorine gas regulating valve;

23) Bellows seal valve ......