2014年3月31日星期一

The structural characteristics of valve

Check valve structure

Bolted bonnet, swing and lift the valve sealing surface of metal.

Body and bonnet connection form

Class150~Class900 using bolted bonnet; by Class1500~Class2500

Class150~Class300 check valve with stainless steel graphite spiral wound gasket; Class600 check valve can be made of stainless steelgraphite spiral wound gasket can also be used metal ring gasket;Class900 check valve can be made of metal ring gasket,Class1500~Class2500 valve with self sealing ring.

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Valve seat

Carbon steel valve seat usually uses forged steel material, the sealing surface of the valve seat can according to the customer request spray welding hard alloy, NPS ≤ 10''check valve adopts a separate type is threaded into the valve seat, if the user needs towelding valve seat structure can also be provided; NPS ≥ 12 valveseat structure by welding; stainless steel check valve valve seatwith integral or in body welding hard alloy directly after processingthe seat. If the user needs, the stainless steel valve seat can also be used separate threaded and welded in seat structure.

Structure characteristics of cast steel swing check valve

Large diameter of the valve design with a ring, convenient lifting.

Bolted bonnet, flange gasket type can be selected according todifferent levels of pressure;

CLASS600 check valve can be used self tight seal pressure.

Valve limiter, prevent the valve open position is too high and can not be closed.

Solid pin installation precision, high strength, ensure the service performance and the service life of the valve

Rocker has enough strength, close enough degrees of freedom tothe valve closed.

The valve has enough strength and rigidity, the sealing surface of the valve clack can according to user requirements of surfacingmetal materials or embedded nonmetal materials.

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Do you know how to install the check valve

Installation

1.Swing check valve: valve type swing check valve cylindrical disk-shaped, around the seat of the shaft for rotation, because the valve channel into a streamlined, flow resistance than the small valve lift check, suitable for large caliber occasions in low flow and no flow frequently changing, but not for the pulsating flow, the sealing performance is less than lift. Rotary check valve sub unicuspid type,double valve type, and most of type three, three by the valve diameter to form the main points, the purpose is to prevent the media to stop the flow or back, the weakening of the hydraulic shock.

2.Lift check valve: the valve body along the vertical centerline of sliding valve, lift check valves can only be installed in horizontal pipelines, the high-pressure valve on the small caliber ball valve can be used. Lift type check valve in the body shape and the samecut-off valve (with valve common), so it is more fluid drag coefficient. Its structure is similar with the valve, the valve body and valve with the same cut-off valve. The lower part of the upper valve and the valve cover processing guide sleeve, the valve guide Janefreely in the valve light oriented, when the medium downstream, the valve thrust open by the media, when the media stopped flow, the valve by the self - vertical landing on the seat, preventing the media from the upstream effect. Straight through lift check valve direction of medium inlet and outlet channel direction perpendicular to the seat; vertical lift check valve, the media import direction crossingchannel direction and the valve seat, the flow resistance is smaller than the straight through.

3.Disc type check valve: valve around the valve pin rotating valve seat. Disc check valve structure is simple, can only be installed in horizontal pipelines, the sealing is poor.

Engineering Chain

4.The pipeline valve: the valve body along the center line of the sliding valve. Pipeline valve is emerging as a valve, its small size,light weight, good processing, is one of valve development. But the fluid drag coefficient than the swing check valve slightly larger.

5.Compression type valve: This valve is used as boiler feed water and steam off with a valve, it has a comprehensive function lift check valve and cut-off valve or angle valve.

In addition, there are some do not apply to pump outlet check valve is installed, such as the end of the valve, spring type, Y type check valve.

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2014年3月30日星期日

The classification of One-way valve

One-way valveand its role is to ensure the directional flow in the pipeline without backflow function. The bottom valve pump suction pipe valve category also belong. Check valves are automaticvalves, pressure 1.6~25MPa/Class150-2500/2.0-42.0MPa working temperature is -29~+550 ℃, materials are: steel WCB, HT250,HT200. Cast iron, QT350, QT450, alloy steel WC6, WC9, CN7M stainless steel CF8 (M), CF3 (M). A105 forging steel, F304 (L),F316L piping. Various conditions of the petroleum, chemical,pharmaceutical, chemical, electric power industry and so on, it is used to water, oil, steam, acid medium. Is the control of the medium in the pipeline one-way flow valve, used to prevent the media back in the pipeline.

Classification

1.Check valve according to its structure, can be divided into the lift check valve, swing check valve and butterfly valve three.

Lift check valve can be divided into two types of vertical and horizontal.

2.Swing check valve is divided into single type, double valve and valve type three.

3.Butterfly valve for the straight through type.

The above non-return valve can be divided into connection, flange connection, welding connection and connected to the clip four is a thread in the connection form.

Opening and closing pieces by medium flow and the forces to open or close, backflow valve to prevent the media called the check valve. Check valves are automatic valves, mainly for one-way flow of media channels, only allowing media to flow in one direction, to prevent accidents.

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Chinabase is able to offer custom, cost-optimized solutions in accordance with customer drawings - such as ready-to-install machine parts and profiles - in addition to our standard products.

The related measures and application of throttle valve

Relevant measures

1.Select the hydraulic radius of the thin edge orifice.

2.Precise filtration and the regular replacement of oil.

3.The appropriate reduction section outlet pressure difference before and after the.

4.The selection of metal materials, the potential difference is smallantioxidant stability of oil, decreasing throttle orifice surface roughness.

Universal joint

Application

As the throttle valve flow depends not only on the area of the throttle orifice, and the pressure difference before and after, small stiffness valve, it is only applicable to the actuator load change is small and the speed stability requirements is not high.

For the implementation of components load throttle governing system changes and requirements for high speed stability, must carry on the throttle pressure compensation to keep the throttlevalve and pressure constant, so as to achieve stable flow.

Chinabase Machinery is a group of manufacturing facilities, offering one-stop solution for mechanical power transmission products in China. We can supply a full-range of power transmission products, such as chains,Engineering Chain, sprockets and plate wheels, pulleys, gearboxes, motors, couplings,Fluid Couplings, gears and racks. Our product range also covers locking assemblies (clamping elements/locking device), taper bushes, QD bushes, bolt-on hubs, torque limiters, shaft collars, motor bases and motor slides, chain detachers, chain guides, universal joint, rod ends and yokes. Our products are used in many different industry sector, like in automation engineering, drive engineering, conveyor technology, assembly and handling technology, packaging industries, the beverage, food and medical engineering, pharmaceutical production, and laboratory equipment.

2014年3月27日星期四

The classification to throttle valve

The throttle valve is by changing the throttle section or throttlinglength to control fluid flow valve. The throttle valve and check valve in parallel can be combined into one-way throttle valve. The throttle valve and the throttle valve is a one-way flow control valve is simple,the quantitative pump hydraulic system, the throttle valve and theoverflow valve, may be composed of three kinds of throttling speed control system, namely the throttle control system, return oil throttle governing system and the bypass throttle speed control system.Throttle valve does not flow negative feedback function, notcompensation caused by the change of load speed is not stable,generally used only for load changes have little or no high speed stability requirements of the occasion.

Fluid Couplings

Classification

Press the throttle channel can be divided into two kinds of straight and angle type; by opening and closing parts of the shape, with a needle, groove shape and form of the three windows.

Adjustable throttle valve: valve needle and the valve core are made of hard alloy, the product is designed according to API6A standard,with wear resistance, erosion resistance. Mainly used for wellhead oil (gas) tree equipment,

Sliding sleeve type throttle valve: valve with low noise and balance the structure, easy to open, the product is designed according to API6A standard, the valve cover the surface of tungsten carbide,suitable for a flash, high pressure, high pressure, cavitationconditions harsh situation, long service life, flow control precision is improved greatly. Applicable to the petroleum, natural gas,chemical, oil refining, hydropower industry.

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The performance requirements and characteristics of throttle valve

Performance

The valve performance requirements:

· Flow rate adjustment range, flow pressure changes smoothly;

And in a small amount of leakage, if there is leakage, leakage tosmall;

· Adjusting torque is small, flexible action.

Universal joint

Throttle valve (Choke valve) shape valve structure and no difference, but they open and close parts of the shape is different.The throttle valve opening and closing parts mostly conical streamlined, through its cross-sectional area and change the channel to regulate the flow and pressure. Throttle valve for thepressure drop under conditions of great pressure to reduce media use.

Medium large flow between the throttle valve and valve seat, so thatthese parts of the surface soon - the so-called cavitation damage.In order to minimize the influence of the cavitation, valve cavitation erosion material (alloy steel manufacturing) and made the top angle of 140 ~ 180 streamlined cone, which also enables the valve to open a larger height, is generally not recommended in the small gap under the throttle.

Characteristics of throttle valve

1.The structure is simple, easy to manufacture and repair, low cost.

2.Regulation accuracy is not high, can not be adjusted to use.

3.Easy sealing surface erosion, cut off the media can not be used.

4.The poor sealing.

Chinabase Machinery is a group of manufacturing facilities, offering one-stop solution for mechanical power transmission products in China. We can supply a full-range of power transmission products, such as chains, Engineering Chain,sprockets and plate wheels, pulleys, gearboxes, motors, couplings, gears and racks. Our product range also covers locking assemblies (clamping elements/locking device), taper bushes, QD bushes, bolt-on hubs, torque limiters, shaft collars, motor bases and motor slides, chain detachers, chain guides, universal joint, rod ends and yokes. Our products are used in many different industry sector, like in automation engineering, drive engineering, Timing Belt Pulleys,conveyor technology, assembly and handling technology, packaging industries, the beverage, food and medical engineering, pharmaceutical production, and laboratory equipment.

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