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.

The main features of Stainless steel needle valve

Stainless steel needle valve in the closed position, the valve is still there inside the pressurized fluid prior to maintenance, lift the front line pressure valve in the open position Instrument manifolds and make repairs before disconnecting the power or gas supply service, the actuator and bracket must first check out on the next ball, after removing the pressure downstream pipeline has indeed only exploded assembly operation and care must be taken to prevent damage to the decomposition of the sealing surface again when the parts assembly, especially the non-metallic parts. Stainless steel needle valve seal reliable, simple structure, easy maintenance, regular spherical surface and seal in the closed state, the media can not easily be eroded, easy operation and maintenance for water, Double ferrule fitting solvents, acids, and natural gas work in general media, and Stainless steel needle valve is also suitable for harsh working conditions of media, such as oxygen, hydrogen peroxide, methane and ethylene, etc., in various sectors has been widely used. Widely used in petroleum refining, long-distance pipelines, chemical, paper, pharmaceutical, water, electricity, municipal, steel and other industries.

Stainless steel needle valve of the course

Stainless steel needle valve refers to the amount of relying on its own motion and automatic referral opening and closing the valve, check valve lift amount has stopped mediated backflow valve. Check valves are an automatic valve, its tail to be mediated by impulse is to stop the amount back, stop the pump and drive motor reversal,High pressure ball valve the war put a container full amount of referrals. Stainless steel needle valve refers to the amount of relying on its own motion and automatic referral opening and closing the valve, check valve lift amount has stopped mediated backflow valve. Check valves are an automatic valve, its tail to be mediated by impulse is to stop the amount back, stop the pump and drive motor reversal, Valve manifolds the war put a container full amount of referrals. Stainless steel needle valve of the valve disc-shaped, around the shaft for rotational movement of the seat channel, due to internal valve passage into a streamlined, smaller than a liter of active resistance butterfly valve for low flow rates and infrequent events changes in large-caliber place, but not for pulsatile flow, the sealing performance is less than lift.

Stainless steel needle valve exterior feature presentation

Stainless steel needle valve 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. Instrument needle valve 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. Including the development of iron and steel, sealing materials, and mechanical processing industries will have a significant impact on the level of technical parameters of the valve. Stainless steel needle valve of strength, ductility,High pressure ball valve  corrosion resistance, resistance to high pressure directly affects the valves, corrosion resistance; production level determines the valve sealing material applicable to medium and can withstand the pressure; precision machining is the impact of the interface seal, the valve head and an important factor in seating levels.

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.

Selection principles stainless steel needle valve

1 , the pipeline system and cryogenic medium , should use plus low bonnet needle valve .
2 , the pipeline system FCCU refinery unit , optional needle valve lift rod .
3 , fixtures and piping systems , such as acid-base chemical systems in corrosive media , should use austenitic stainless steel , Teflon seat ring in  Stainless steel needle valve .
4 , metallurgical systems, piping systems or devices on the power system , petrochemical plants , urban heating systems in high-temperature medium , the choice of metal to metal seal needle valve .
5, the need for flow regulation , the choice of the worm gear , pneumatic or electric adjustment with a V -shaped opening needle valve .
6 , transmission mains oil, natural gas , it is necessary to clean the pipeline , buried in the ground and the need , use full bore , all-welded construction needle valve ; buried in the ground , choose full bore welded or flanged connections the ball valve.
7 , pipelines and storage facilities for refined oil products , the choice of needle valve flange connection .
8 , city gas and natural gas pipeline , the choice of the needle valve flange and the threaded connection .
9 , metallurgical oxygen pipeline system , should use rigorous degreasing treatment , needle valve flange connection .

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 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 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 .