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About UsTianjin Nuclear Technology Industrial Co., Ltd. was established in 2010. It is a national high-tech enterprise integrating R & D, design, manufacturing and sales of industrial valves.
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ProductsThe company mainly produces GB, ANSI/API, JIS, DIN, BS, NF and other standards of control valve, ball valve, gate valve, globe valve, check valve, power station valve, butterfly valve and other related products.
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Parameter comparison of stop valve and regulating valve
Release time:
25 Oct,2023
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According to the function of the valve, there are mainly two kinds of cut-off and regulation of pipeline medium flow. Users can choose their own valve model according to their own working conditions. Then how to choose cut-off and regulating valve
Introduction of 1. stop valve
Usually selected as a cut-off and open medium with the valve, the general choice of flow for straight-through valve, because of its small flow resistance. The downward closed valve (cut-off valve, plunger valve), due to the twists and turns of the flow path, flow resistance is higher than other valves, it is less selected. However, in the case of high flow resistance, closed valves, such as globe valves and plunger valves, can be used.
1. Straight-through stop valve
2, DC cut-off valve: In DC or Y-shaped cut-off valve, the flow channel of the valve body and the main flow into a slash, so that the degree of damage to the flow state is smaller than that of the conventional cut-off valve, so the pressure loss through the valve is correspondingly small.
3, angle type stop valve: in the angle type cut-off
4. Plunger type globe valve: This form of globe valve is a variant of regular globe valve. In this valve, the disc and valve seat are usually designed based on the plunger principle. The valve clack is polished to connect the plunger and the valve stem, and the seal is realized by two elastic sealing rings on the plunger. The two elastic sealing rings are separated by a collar, and the sealing rings around the plunger are pressed firmly by the load applied to the bonnet by the bonnet nut. Elastic ring can be replaced, can be made of a variety of materials, the valve is mainly used for "on" or "off", but with a special form of plunger or special collar, can also be used to adjust the flow. In the stop valve, the fluid only needs to change direction once, so that the pressure drop through the valve is smaller than that of the stop valve of the regular structure.
Position of the thread on the stem
1. Threaded stem globe valve: thread of stem of globe valve
On the outside of the valve body. The advantage is that the valve stem is not eroded by the medium and is easy to lubricate. This structure is more common.
2. Lower thread stem globe valve: The thread of the stem of the globe valve is in the valve body. This kind of structure stem thread is in direct contact with the medium, which is easy to be eroded and cannot be lubricated. This structure is used for small caliber and low temperature places.
Domestic production of valve manufacturers more, the connection size is mostly not uniform. Mainly divided into the following categories: JB/T2203-1999 "cut-off valve structure length" based on the general class. At present, most domestic valve manufacturers are designed and produced according to this standard. However, this standard is not perfect and the specifications are incomplete. The large nominal diameter of single gate stop valve * * * is DN1200, and the large nominal diameter of double gate stop valve * * * is DN1500. According to the specifications of the globe valve produced by the manufacturer and the information available, the current nominal diameter of the angle globe valve is DN15, and the nominal diameter of the Z-type straight-through globe valve reaches DN2000. After textual research, the connection size of each manufacturer is not uniform. In order to have a unified standard, users in the selection and installation of the same specifications can be interchangeable, it is recommended that China General Machinery Research Institute of JB/T2203-1999 "stop valve structure length" revised. It is suggested that the design institute and the user should choose according to the standard, and the stop valve manufacturer should design and manufacture according to the standard.
Introduction of 2. control valve
Usually choose easy flow control valve as control flow. General control valve to choose a closed valve (such as control valve), because it is a proportional relationship between the seat size and semi-closed stroke. Rotary valves (plug valves, ball valves, butterfly valves) and flexible body valves (pinch valves, diaphragm valves) can also be used for throttle control, but usually only within a limited range of valve diameters. Gate valve is a disc-shaped gate to the circular seat mouth for cross-cutting movement, it is only close to the closed position in order to better control the flow, it is usually not used for flow control.
1. Pneumatic control valve
According to the form of pneumatic actuator classification
a. Film actuator. It is also divided into straight-mounted type (positive action and reaction) and side-mounted type (positive action and action)
B. The piston actuator is divided into proportional type (positive action and reaction and two-position type.
c. Long-stroke actuator
D, rolling film actuator.
2, according to the adjustment form classification:(a) adjustment type; (B) cut off;(c) regulation cut off type.
3, according to the type of movement classification:(a) straight stroke; (B) angular stroke.
4. Classification according to spool shape:(a) flat spool; (B) plunger-shaped spool;(c) window-shaped spool;(d) sleeve-shaped spool;(e) multi-stage spool;(f) off-spin spool;(g) butterfly spool;(h) ball spool.
5. Classified by flow characteristics:(a) straight line; (B) equal percentage;(c) parabola;(d) quick opening.
6, according to the valve cover on the form of classification:(a) ordinary type; (B) scattered (suction) heat type;(c) long neck type;(d) bellows seal type.
2. Electric control valve
1. Classified according to the form of electric title institutions:(a) angular stroke; (B) straight stroke;(c) multi-rotation type.
4. Classified according to the form of the upper cover:(a) ordinary type; (B) scattered (absorption) heat type;(c) long neck type;(d) bellows seal type.
5. Manual control valve. According to the classification of valve core characteristics: conical; plunger shape; sleeve shape; multi-level; partial rotation; butterfly; spherical or hemispherical.
6. (Electric) hydraulic control valve.
7. Intelligent adjusting machine valve.
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