Stainless steel needle valve structure in the form of presentation

Stainless steel needle valve pneumatic device safe, reliable, low cost, easy maintenance, the structure of the valve drive a big branch. World Valve Network Xiaobian for you Instrument needle valves in detail the structure of the valve pneumatic device technology requirements and performance requirements for reference. Structural technical requirements valve pneumatic device: the pneumatic cylinder by means opening indication, stroke limit, pneumatic components, manual mechanism, signal feedback and other components. Pneumatic device with a buffer mechanism, the stroke length of the buffer mechanism can refer to Table l requirements. Buffering mechanism with adjustable pneumatic devices, there should be external to adjust its buffer cylinder body. Stainless steel needle valve with Instrument valve manifolds manual mechanism in the gas supply is interrupted, the valve should open and close operations can be performed manually institutions, while facing the hand wheel, hand wheel or handle counterclockwise rotation of the valve should open the valve clockwise turn off. Rod ends for the inner and the outer thread, there should be a standard spanner wrench applicable mouth. Piston seals should be easy to replace and repair. Stainless steel needle valve when the main line in the pipeline and gas pipeline buried in the ground in the need, the need to use full bore welded ball valve.(Double ferrule fitting)  in the wider application of irrigation systems, mainly used in the branch entrance. Ball simple structure, small size, resistance to fluid flow is small, the disadvantage is turned on or off too quickly, it will produce water hammer (when a sudden change in the flow velocity in the pipe pressure will rise) in the pipeline. Therefore should not be used in the main pipe valve, available in dry, or the end of the branch pipe for wash-use, flushing sewage effect.

Stainless steel needle valve is the instrument to measure the pipeline system is an important part of

Its function is turned on and off the pipeline path. Good sealing needle valve, needle valve long service life, even after the needle valve sealing surface damage, needle valves only need to replace wearing parts, needle valves can continue to use. Needle valve should be installed so that the flow is consistent with the direction of the arrow on the valve body medium. Needle valves are often used with pressure transmitters, Trunnion ball valves flow meters and other ancillary equipment. Stainless steel needle valve is used to adjust the carrier gas flow rate, and some instruments use it to control the flow of gas and air. Adjustment handle on a connection in a straight shaft, which stem in the lower end of the shaft that was pointed cone valve needle 5, by changing the relative position of the valve needle valve to control the flow. When adjusting the handle rotated in a counterclockwise direction,Instrument needle valve the gap increases with the valve needle valve, gas resistance decreases, thus increasing the outflow from the needle valve gas flow. When adjusting the handle is turned clockwise, the valve needle valve seal will hold him down, the needle valve is closed. Embed a fluorine rubber gasket groove in the middle of the stem. I.e., the seal ring 4, and its surface is coated with silicone vacuum grease, the stem moves when the seal ring is always in close contact with the inner wall of the valve body, the valve body to maintain a sealed state when the needle valve is not working, the needle valve should be full (this point and the regulator valve opposite) to prevent the valve needle stuck in the valve inlet seal also prevents the spring prolonged pressure and failure.

Profile stainless steel needle valve

Stainless steel needle valve is the instrument to measure an important part of the piping system , the main shut-off valve and ball High pressure needle valve , its function is to be used to turn on or off the pipeline path .
Card sets with easy installation and removal instrument valves , connections are tight , there is conducive to fire , explosion and high voltage capability , good sealing performance, etc., are power plants, oil refineries, chemical plant piping and instrumentation to measure an advanced connection valve. This type valve in the pipe should generally be installed horizontally.
Stainless steel needle Instrumentation ball valve sealing a good , long life, even after the sealing surface is damaged, only need to replace wearing parts , you can continue to use.
Should be installed so that the flow is consistent with the direction of the arrow on the valve body medium .
1 , needle valves standards , needle valves with easy installation and removal , needle valve connections are tight , the needle valve is conducive to fire , explosion and needle valve high pressure capability . Needle valve sealing performance advantages of a good valve power plant , oil refinery, chemical plant piping and instrumentation to measure connection in an advanced way . Good sealing needle valve , needle valve long service life , even after the needle valve sealing surface is damaged , needle valves only need to replace wearing parts , needle valves can continue to use. Needle valve should be installed so that the flow is consistent with the direction of the arrow on the valve body medium . Needle valve is a valve can be precisely adjusted broader purposes such as flame cutting with the cutting from the flame temperature adjustment knob is needle valves, instrumentation needle valve instrument measuring the piping system is an important part of the main needle valve there are shut-off valves and ball valves , needle valves whose function is to be used to turn on or off the pipeline path .
Stainless steel needle valve base on self-designed structure , is currently the most popular new generation valve.
First, the body 's anti-corrosion, mainly correct selection of materials . Although corrosion data is very rich, but whether the election was appropriate or not an easy thing , because the corrosion problem is very complex. Choose body material difficulties, lies not only consider the corrosion problem , but must consider the ability to withstand temperature , whether economically reasonable , is it easy to buy and other factors .

The performance advantage of the fixed ball valve

1, the operation is labor-saving: ball support, composed of upper and lower bearings to reduce friction, due to the elimination of the great seal load inlet pressure to promote the ball with the sealing seat formation caused by excessive torque.
2, reliable sealing performance: PTFE unisexual material sealing ring is embedded in the stainless steel Stainless steel needle valve seat, metal seat end with the spring to ensure adequate pre tightening force of sealing ring, valve sealing surface is abraded during use, in the spring under the action of the valve to ensure good sealing performance.
3, structural fire protection: to prevent the sudden appearance of heat or fire, burn the PTFE sealing ring, large leak occurred, and contribute to the fire, in the ball and valve seat sealing ring is arranged between the fire, when burned in the ring, under the action of the spring force, will quickly push the ball valve seat sealing ring, the formation of metal and metal seal, to a certain degree of sealing effect. Fire test to meet the requirements of APl6FA and APl607 standard.
4, automatic pressure relief feature: when the medium pressure cavity inside the Instrument valve manifolds is much higher than the pre] spring force, the seat back from the ball, to the effect of automatic pressure relief, pressure relief valve seat after automatic complex
5, a drain line: all set vent valve body, valve seat can check whether leakage occurs in the work, the valve is fully open or fully closed, remove the pressure in the chamber, can be directly replace packing; can cavity left in emissions, reduce pollution medium on the valve.

Valve

The High pressure needle valve is in fluid system, a device used to control the direction of the fluid flow, pressure, is to make the piping and equipment within the media (liquid, gas, powder) device for controlling the flow of energy flow or stop and the.
The Instrumentation ball valve is a pipeline control unit of fluid delivery system, which is used to change the channel section and flow direction of medium, with diversion, cut-off, throttling, check, diversion or overflow relief functions. For fluid control valves, valve from the simple to the extremely different kinds of valve control system used in complex, its many varieties and specifications, the valve nominal diameter pipeline industry from large to tiny instrument valve diameter up to 10m valve. Can be used for the control of water, steam, oil, gas, mud, all kinds of corrosive medium, the liquid metal and radioactive fluids and other types of fluid flow, the valve working pressure is from 0.0013MPa to 1000MPa of ultra high pressure, working temperature from ultra low temperature to high temperature of 1430 DEG C -270 C.
The control valve can use a variety of transmission, such as manual, electric, hydraulic, pneumatic, pneumatic turbine, electromagnetic, electromagnetic hydraulic, electric hydraulic, pneumatic and hydraulic, gear, bevel gear drive; in pressure, temperature or other forms of sensor signals under the action, according to the requirements, or not depends on the sensing signal and a simple open or closed, the valve to rely on drive or automatic mechanism to make the opening and closing parts for lifting, sliding, rotating or turning motion, so as to change the size of the flow area to achieve the control function.

Classification of instrument valve

Not according to the Instrument needle valve valve instrument valve function, can be divided into the following categories:
By end use can be divided into: cut-off valve, check valve, safety valve, regulating valve, diverter valve.
According to its use in the nominal pressure can be divided into: vacuum valve, low pressure valve, the pressure valve, high pressure valves, high pressure valve.
According to the normal use of the working temperature of classification can be divided into: ultra-low temperature valve, cryogenic valves, valve, normal temperature valve, high temperature valve.
According to different braking modes can be divided into: automatic valve, automatic valve is divided into (safety valve, pressure reducing valve, drain valve, check valve, automatic control valve); to drive the valve, to drive the valve can also be divided according to different power source (electric valve, pneumatic valve, hydraulic valve, pneumatic valve electric valve, manual valve,).
According to the fluid through the Instrumentation ball valve diameter size can be divided into: small diameter instrument valves, diameter instrument valves, large diameter, large diameter instrument valves instrument valves.
According to the structure of instrument valves of different shapes can be divided into: valve shape, cock shaped, plug valve, rotary valve, butterfly valve line, line.
According to the connection mode of instrument valves and other fittings can be divided into: the threaded connection, flange connection Instrument Valves instrument valves, instrument valve, welded connection clamp connection instrument valves, the card sets of connections instrument valves, instrument valves on the clip connection.
According to manufacturing the used instrument valve material is divided into; metal materials, non-metallic materials instrument valves Instrument Valves instrument valves, metal body lining.
Instrument valves of all kinds of too much may have other kinds of classification, but it is still used for industrial pipe valve, throttle valve, ball valve, butterfly valve, diaphragm valve, plunger valve, plug valve, check valve, safety valve, relief valve, drain valve etc..

Instrument valve

Instrument valve manifolds valve is a pipeline accessory. It is used to change the channel section and flow direction of medium, control of a device for conveying medium flow. The sealing performance of Instrument manifolds valve instrument valve refers to the part of the sealing ability to prevent media leaks, it is the technical performance index of instrument valve is the most important. Sealing parts instrument valve has three parts: opening and closing parts at the contact and valve seat sealing surface between the two; filler stem and the stuffing the distribution and office; valve connection with the valve cover. The first one is called the leak within the leak, which is usually known as Guan lax, it will affect the ability of instrument valves truncated medium. For the truncated valve, the internal leakage is not allowed. Leakage after the two called the leakage, that media leaks from the valve to the valve outside. Leakage will result in material loss, pollution of the environment, can also cause serious accidents. The explosive, toxic or radioactive medium, leakage is allowed, and thus the instrument valve must have a reliable sealing performance.