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Brief analysis of valve spool preparation instructions

The valve core is often used as an explosion-proof solenoid valve. It is a big mistake. The valve core is directly constructed by the valve body. The general valve core is distinguished by 50/25. Now it should be understood. When the valve body When the DN500, the spool is 250MM. This has been deduced on the OK. It is just half, everyone also learn.
Global valve future development trend
With the development of foreign large-scale complete sets of technology, a series of new types of equipment and stand-alone machines have emerged. The development of new types of equipment related to valves is characterized by large-scale, high-parameter, high-performance automation and complete sets, which are compatible with the control methods of these complete sets of equipment. In the past 20 years, the control methods of foreign valves have also developed greatly. In addition to general manual, mobile, electric, pneumatic, hydraulic drive, electro-hydraulic linkage, gas-liquid linkage, automatic control of the valve species continue to increase, and there is a trend of further development.
Such as refining equipment. The largest refinery is 36.4 million tons/year (Virgin Islands in the Caribbean) and 30 million tons/year (Venezuela). At present, there are nearly 30 oil refineries with annual capacity of over 20 million tons; the capacity of the largest unit refinery pressure reduction unit has reached 24 million tons/year, the catalytic cracking unit has reached 8.24 million tons/year, and the hydrocracking unit has reached 3.2 million tons/year. year. Larger devices have forced larger and larger valves and control methods have begun to develop in the direction of automation.
In recent years, long-distance pipelines have developed rapidly. The main reasons for this are low cost, which is equivalent to only one-third of the railway transportation; second, it is buried underground, and it is not easy to destroy; and third, the speed of pipeline construction is high and investment is low. Therefore, the demand for valves for long-distance pipelines has greatly increased in recent years. The maximum unit capacity of power generation equipment is 1.2 million kW for twin shaft thermal power units, 1.2 million kW for single shaft thermal power units, and 1.3 million kW for the largest nuclear power unit.
The diameter of the largest flat gate valve in these valves is 1620mm, 2000mm; the maximum butterfly valve diameter is 9750mm; the maximum ball valve diameter is 3050mm; the weight of the valve of the drive device is 184 tons; the valve diameter of the largest water valve is 2750mm, and the pressure reaches 9MPa.
The economic effect of large-scale equipment summed up, first, to increase production efficiency, second, to reduce infrastructure investment, and third, to reduce the consumption of raw materials. With annual refining capacity of 5 million tons of oil refining equipment and 1 million tons, the investment per ton of product production capacity is reduced by 50%. A 6-million-ton/year oil refinery compared with two 3 million-ton/year oil refineries, the investment is only equivalent to 69% of the latter, steel consumption is 53%, floor area is 54%, production cost is 75%, However, labor productivity has increased to 170%.
Chinese and English valve name comparison table
1-01 Self-acting valve Self-acting valve Relying on the ability of the media itself
1-02 Actuated valve Actuated valve Manually, electrically, hydraulically or pneumatically operated valves
2-01 Gate Valve,valve valve,slide valve The valve is driven by the valve stem and moves up and down along the sealing surface of the valve seat.
2-02 parallel gate valve parallel gate valve,parallel slide valve gate valve with parallel sealing surfaces on both sides of the gate
2-03 Wedge gate valve Wedge gate valve
2-04 Lifting Rod Gate Valve Outside screw stem rising through handwheel type gate valve
2-05 Rotary Rod Type Gate Valve Inside screw nonrising stem type gate valve
2-06 Quick open-and-close gate valve Quick-close and gate valve
2-07 Shrinking gate valves Contraction cavity gate valve Valves with different diameters in the valve body, the diameter of the valve seat sealing surface is smaller than the diameter of the flange connection valve
2-08 Flat gate valve This type of gate valve has points with diversion holes and no diversion holes. The flat gate valve with diversion hole can clear the ball through the ball. The flat gate valve without diversion hole can only Used as opening and closing device on the pipeline
3-01 Butterfly Valves Valves for opening and closing parts (discs) rotating around a fixed axis
3-02 center line butterfly valve Center line-type butterfly valve butterfly valve center of rotation (that is, the valve shaft center) is located in the valve body's center line and butterfly plate seal section on the butterfly valve
3-03 single-eccentric butterfly valve Single-eccentric center butterfly vale The center of rotation of the butterfly plate (ie the center of the valve shaft) is located on the centerline of the valve body and forms a butterfly valve with a size offset with the butterfly plate sealing surface.
3-04 Double Eccentric Butterfly Valve Double-eccentric center butterfly valve The center of rotation of the butterfly plate (ie, the center of the valve shaft) forms a size offset with the disc sealing section, and forms a butterfly valve with another size offset from the centerline of the valve body.
3-05 Three-eccentric center butterfly valve The center of rotation of the butterfly plate (ie, the center of the valve shaft) forms a size offset with the disc sealing surface and forms another size offset with the centerline of the valve body; The centerline of the face forms an angle-biased valve with the centerline of the valve seat (ie, the centerline of the valve body)
4-01 Rotary valve Rotary valve Valve for relative rotation of opening and closing parts along the valve seat seal surface axis
4-02 Ball valve Ball valve The valve that rotates around the axis perpendicular to the passage.
4-03 Float ball valve Ball valve without fixed shaft
4-04 Fixed ball valve Fixed ball valve Fixed ball valve
4-05 Flexible ball valve Flexible ball valve Ball valve with ball screw
4-06 Plug Valves Cock,plug Valves that rotate around their axis
4-07 Clamping Plug Valves Clampyte plug valve Plugs without plugs, plugs and plug sealing surfaces Rely on tightening the nuts on the underside of the plug.
4-08 Packed Plug Valves Cland packing plug valve Packed Sealed Plug Valves
4-09 Self-sealing plug valve The plug between the plug and the plug body mainly depends on the pressure of the medium itself to realize the plug valve.
4-10 Oil Sealed Plug Valve Lubricated plug valve Grease Sealed Plug Valve
4-11 Rotary Column Valves Cock,plug Valves for opening and closing (cylindrical stopper) around its axis
5-01 Baffler valve Baffler valve Opening and closing parts (baffle) to move relative to the valve seat sealing surface outside the valve seat sealing surface but not through the valve seat sealing surface
5-02 globe valve, stop valve The valve (valve) is driven by the valve stem and moves up and down along the axis of the valve seat (sealing surface).
5-03 Upper thread stem shut-off valve Outside screw stem stop valve Stem valve thread outside the housing
5-04 Lower thread stem shut-off valve Inside screw stem stop valve Stem valve stem thread in the housing
5-05 Straight-through shut-off valve Globe Valve media inlet and outlet both channels in the same direction, a 180° stop valve
5-06 Angle Globe Valves Angle pattern globe valve Both inlets and outlets of media are 90° stop valves
5-07 three way stop valve three way stop valve
5-08 DC globe valve Oblique type globe valve Globe and valve angled globe valve
5-09 Plunger type globe valve Plunger type globe valve is a variant of the conventional globe valve. Its valve disc and valve seat are designed according to the principle of the plunger; the valve flap is designed as a plunger, and the valve seat is designed. A complete set of rings, sealed by the cooperation of a plunger and a collar
5-10 Needle globe valve Needle globe valve Globe valve orifice size smaller than the nominal diameter of the globe valve
6-01 Throttle valve Throttle valve to change the cross-sectional area of the passage through the opening and closing part (valve) to adjust the flow rate. Pressure of the valve
6-02 Check valve flap valve Trench type disc throttle valve Commonly used expansion valve in cryogenic equipment
6-03 Window Type Disc Throttle Valve Window type disc brake valve Applicable to the larger size of the throttle valve
6-04 Plug valve throttle valve Plug disc throttle valve Suitable for medium and small diameter throttle valve
7-01 check valve,Non-reture valve The valve (valve) is a valve that automatically prevents the medium from flowing back by the force of the medium.
7-02 Swing check valve Swing check valve
7-03 Single flap swing check valve Single disc swing check valve Single flap swing check valve
7-04 Multi-disc Swing Check Valve Multi-disc swing check valve Swing check valve with more than two discs
7-05 Lift check valve Lift check valve Check valve for lifting movement perpendicular to the valve seat hole axis
7-06 Foot valve Foot valve installed at the suction end of the pump to ensure that the water is filled in the suction pipe.
7-07 spring load lift check valve Spring-loaded lift check valve This valve not only reduces the water hammer pressure, but also has a smooth flow path and low flow resistance.
7-08 spring-loaded annular disc lift check valve Spring-loaded annular disc lift check valve This valve has a smaller valve stroke than the conventional structure of the lift check valve, and it is closed by the spring load. Rapidly, therefore, more conducive to reducing water hammer pressure
7-09 Multi-annulus Lift Check Valve Multi-annulus lift check valve This valve has the smallest disc stroke, so it closes more quickly
7-10 Butterfly check valve Butterfly swing check valve Shape similar to the butterfly valve, check valve flap rotation around the fixed axis (without rocker) check valve
7-11 Line check valve Check valve that slides along the center line of the valve body. The valve is small, light weight, and has good processing technology, but the flow resistance coefficient is slightly larger than the swing check valve. Big
7-12 No-load running check valve This is a special-purpose check valve, which is used for the outlet of the boiler feed pump to prevent the back flow and the emptying of the medium.
7-13 Slow closing check valve Dashpot check valve Sets a buffer device on a swing check valve or lift check valve to form a slow closing check valve. This check valve can effectively prevent water hammer.
7-14 diaphragm check valve Diaphragm type check valve This valve is a new structure of the check valve, although its use is limited by the temperature and pressure, but it prevents the water hammer pressure than the traditional swing type Check valve is much smaller
7-15 Tapered Diaphragm Check Valve Tapered diaphragm type check valve This valve clip is installed between two flanges of the pipe, and the closing speed is extremely fast.
7-16 Annular woven diaphragm type check valve Annular woven diaphragm type check valve This valve uses a pleated ring-shaped rubber diaphragm, which has a very fast closing speed, but its application range is usually subject to pressure difference (△p<1MPa) and temperature (t Restriction of <70°C)
7-17 ball check valve Ball check valve Rubber ball (single ball and multiple ball) under the action of the media, in the ball cover in the direction of the center line of the valve body for a short trip back and forth to achieve its opening and closing action
8-01 Safety valve An automatic valve that uses the force of the media itself to discharge a nominal amount of fluid without any external force to prevent the pressure in the system from exceeding a predetermined safe value. When the pressure returns to normal, the valve Reclose and stop the media from flowing out
8-02 Weighted safety valve Weighted safety valve A check valve that uses a lever and a hammer to balance the valve pressure. This structure can only be used on fixed equipment. The weight of the weight should not exceed 60kg.
8-03 spring type safety valve Spring type safety valve Use the force of the compression spring to balance the pressure of the valve flap and make it seal the safety valve. The spring force of such safety valve should not exceed 20000N in general.

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