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Address:Port City Of Shamen Town, Yuhuan County, Taizhou City, Zhejiang Province, China

Contact:Amy Hou

Mobile:+8618906570891 

E-mail:amy@brass-valve-machine.com

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Ball valve
May 25, 2018

ball valve in the field of Marine engineering and ship should stop valve), the standard of GB/T21465-2008 "valve terms" is defined as: opening and closing (sphere) driven by the valve stem, and around the ball valve axis rotation movement of the valve.

Can also be used on regulation and control of fluid, including hard seal ball valve v-shaped the v-shaped ball core of carbide surfacing with strong shear force between metal valve seat, especially suitable for fiber, tiny solid material, such as medium.

The multi-pass ball valve can not only flexibly control the flow, shunt and flow direction of the medium, but also can close any channel and connect the other two channels.

This valve should be installed horizontally in the pipe.

Ball valve classification: pneumatic ball valve, electric ball valve, manual ball valve.      

 

history

Ball valve (ball valve) appeared in the 1950 s, with the ball valve with the rapid development of science and technology, continuous improvement of production technology and product structure, in just 40 years, has rapidly developed into a kind of main valve class.

In western industrialized countries, the use of ball valves is increasing year by year.

In our country, the ball valve is widely used in petroleum refining, long pipeline, chemical industry, paper making, pharmacy, water conservancy, electric power, municipal, industries such as steel, holds the pivotal status in the national economy.

It has a rotation of 90 degrees, and the plug is a sphere, with a circular hole or passage through its axis.

The ball valve is mainly used in the pipeline to cut, distribute and change the flow direction of the medium. It only needs to rotate the 90 degree operation and small rotational torque to close the tight.

Ball valve is suitable for switch, cut-off valve, V ball valve.

Electric valves in addition to the pipeline parameters should be paid attention to, still should pay special attention to the use of environmental conditions, due to the electric valve electric actuator is a mechanical and electrical equipment, in the state of its use by the use of impact on the environment.

Normally, the electric ball valve and butterfly valve should pay special attention in the following environment.

The characteristics of

A;

Wear resistance;

Because the valve core of the hard sealing ball valve is alloy steel spray welding, the three-piece ball valve sealing ring is alloy steel surfacing, so the hard sealing ball valve will not produce too much wear on the switch.

(its hardness coefficient is 65-70):

2.

Good sealing performance;

Because the seal of the hard seal ball valve is used by manual grinding, until the valve core is completely consistent with the sealing ring, it can be used.

So his sealing performance is reliable.

Three;

Light switch;

The switch is very light when the outside force exceeds the spring's pretensioning force, because the bottom of the sealing ring of the hard sealing ball valve is used to hold the sealing ring and the valve core tightly together.

Four;

Long service life: it has been widely used in petroleum, chemical industry, power generation, paper making, atomic energy, aviation, rocket and other departments, as well as People's Daily life.

Pneumatic ball valve structure is compact, reliable sealing, simple structure, convenient maintenance, sealing surface and the spherical often in the closed state, not easily be medium erosion, easy operation and maintenance, and is suitable for water, solvents, acids and generally working medium, such as natural gas is mainly used for cutting or on line in the medium, can also be used to adjust and control of the fluid.

Compared with other valve types, pneumatic ball valves have angular stroke output torque, open fast, stable and reliable, widely applicable, etc.

1. The thrust bearing reduces the friction torque of the stem, which can make the valve stem operate smoothly and flexibly for a long time.

2. Anti-static function: set the spring between the ball, stem and valve body, and can export the static electricity generated by the switch process.

3. Due to the good self-lubrication of ptfe and other materials, the friction loss of the ball is small, so the service life of the pneumatic ball valve is long.

4. Small fluid resistance: the pneumatic ball valve is one of the least fluid resistance in the classification of all valves, even the reducing pneumatic ball valve, its fluid resistance is quite small.

5. The stem seal is reliable: as the stem only ACTS as if it is transported without lifting, the packing seal of the stem is not easily damaged, and the sealing ability increases with the pressure of the medium.

6. The seat sealing performance is good: the sealing ring made of polytetrafluoroethylene and other elastic materials is easy to seal, and the valve sealing ability of the pneumatic ball valve increases with the increase of medium pressure.

advantages

1. The fluid resistance is small, and the ball valve with full diameter has no flow resistance.

2. Simple structure, small size and light weight.

3. Tight and reliable.

It has two sealing surfaces, and the sealing material of the ball valve is widely used in various plastics, sealing well, and can be fully sealed.

It is also widely used in vacuum systems.

4. Easy to operate, open and close quickly, high-performance ball valve from fully open to close just rotate 90 °, is advantageous for the remote control.

5. Easy to maintain, simple structure of ball valve, the sealing ring is generally active, it is convenient to remove and replace.

6. The sealing surface of the ball and seat shall be separated from the media when full or closed, without causing erosion of the sealing surface of the valve.

7. Wide range of applications, ranging from small to several millimeters, large to several meters, from high vacuum to high pressure can be applied.

8. As the ball valve is wiper in the opening and closing process, it can be used in the medium with suspended solid particles.

High machining accuracy, high cost, not suitable for use in high temperature, such as impurities in the pipe, easy to be blocked by impurities, so that the valve cannot be opened.

Matters needing attention

(1) it is necessary to find out that the pressure of the ball valve and the downstream pipeline have been removed before the disassembly and decomposition operation can be carried out.

(2) the non-metal parts should be removed from the cleaning agent immediately after cleaning, and shall not be soaked for a long time.

(3) the bolts on the flange at assembly time shall be tightened evenly, gradually and evenly.

(4) the cleaning agent shall be compatible with the rubber parts, plastic parts, metal parts and working media (such as gas) in the ball valve.

When working medium is gas, use gasoline (gb484-89) to clean metal parts.

Non-metallic parts are cleaned with pure water or alcohol.

(5) each individual ball valve part that is decomposed can be cleaned by immersion.

The metal parts that have not been broken down can be cleaned with clean and fine impregnated cloth (to prevent the fibers from falling off and sticking to the parts).

When cleaning, remove all grease, dirt, glue, dust, etc. that adhere to the wall.

(6) when the ball valve is decomposed and reassembled, it must be careful to prevent the sealing surface of the damaged parts, especially the non-metal parts, and use the special tools in order to remove the o-ring.

(7) after cleaning, it needs to be assembled with the cleaning agent of the wash wall after evaporation (it can be cleaned with the silk cloth of unsoaked cleaning agent), but it must not be put aside for a long time, or it will rust and be contaminated with dust.

(8) the new parts should be cleaned before assembly.

(9) lubricate with grease.

Grease should be compatible with ball valve metal material, rubber parts, plastic parts and working medium.

When the working medium is gas, it can be used for example.

Apply a thin layer of grease on the surface of the sealing part, and apply a thin layer of grease on the rubber seal, the sealing surface of the valve stem and a thin layer of grease on the friction surface.

(10) when assembling, it shall not allow the dust and other impurities such as dust and other impurities and foreign substances to be contaminated, adhered or stuck on the surface of the parts or into the inner cavity.

Folding classification characteristics

Ball valve points are: the floating ball valve, the fixed ball ball valve, track ball, v-shaped ball valve, three-way ball valve, stainless steel ball valve floating ball valve door valve, cast steel ball valves, forged steel ball valve, sulfur discharge ball valve, ball valve, pneumatic ball valves, electric ball valves, card sets of ball valves, welding ball valve.

According to the shell/main material classification, ball valve can be divided into:

1. Valve: metal materials such as carbon steel, alloy steel, stainless steel valve, cast iron valve valve, the titanium alloy valve and monel valve, copper alloy, aluminum alloy, lead alloy valve valve valve, etc.

2. Metal body lining valves: rubber valve, fluorine valve, lead valve, liner plastic valve, lining enamel valve.

3. Non-metallic material valves: ceramic valves, glass valves, plastic valves.

Domestic production ball valve manufacturers are more, the connection size is also mostly unitary.

The main categories are:

Ball valve ball is floating, under the pressure of the medium, the ball can produce a certain displacement and tight pressure on the outlet end sealing surface, to ensure the outlet seal.

Folding structure

Sealing is good, but all spheres of work under medium load to export sealing ring, so should consider to seal material can withstand the working load of sphere medium, under high pressure shock, sphere migration may occur.

This structure is generally used for medium and low pressure ball valves.

The valve ball valve ball valve ball valve ball is fixed, the pressure does not produce movement.

Fixed ball valves have floating seats, which are moved by the pressure of the medium to press the sealing ring onto the ball to ensure the seal.

Generally, bearings are fitted on the upper and lower shafts of the ball, and the operating torque is small, suitable for high pressure and large diameter valves.

To reduce the number of ball valve operating torque and increase the reliability of the seal, and the oil seal ball valve, both betting special lubricant between the sealing surface, in order to form a layer of oil film, which increases the sealing, and reduce operating torque, suitable for high pressure large diameter ball valve.

Fold the elastic

Ball valve spherical elastic.

The ball and seat ring are made of metal material. The pressure of the sealing pressure is very high. The pressure of the v-type ball valve on the medium itself has not reached the requirement of sealing, and the external force must be applied.

This valve is suitable for high temperature and high pressure media.

An elastic sphere is an elastic groove that is placed in the lower end of the inner wall of the sphere.

When closing the channel, use the wedge head of the stem to push the ball up and the seat pressure close to seal.

Loosen the wedge head before turning the ball, and the ball will return to its original shape, allowing a small gap between the ball and the seat to reduce the friction and operating torque of the sealing surface.

Qv347, Qv647, Qv947 V type regulating ball valve.

Qv347, Qv647, Qv947 V type regulating ball valves have a v-shaped structure with a shear effect on the seat.

Therefore suitable for papermaking, chemical industry, metallurgy and other industrial enterprises contain fiber or small solid particles in suspension medium on the technological parameters control, especially suitable for pulping and papermaking pulp black liquor, white water, in the process of production, such as white liquor suspended particles of fluid and the strong, muddy fluid automatically adjust slurry.

This type V ball valve is a fixed ball valve, also a single seat sealing ball valve, the regulating performance is the best in the ball valve, the flow characteristic is equal to the percentage, adjustable ratio up to 100:1.

Its v-shaped notch and metal seat have shear function, especially suitable for fiber, micro solid particles, slurry and other media.

Tee ball valves have type T and L.

The t-type can connect three orthogonal pipelines and cut off the third channel, which can divert and confluence.

The l-type can only connect two orthogonal channels, and can not maintain the connection of the third pipe at the same time, and only play the role of distribution.

Product features

1. The three-way ball valve adopts the integrated structure in the structure, the sealing type of the 4-face seat, the flange connection is less, the reliability is high, the design realizes the lightweight.

2. The three-way ball core is divided into t-type and l-type, with long service life, large circulation capacity and small resistance.

3. The ball valve is divided into two types according to the action type and the double action. The single acting type is the condition that the ball valve will be in the control system when the power source fails.

Advantage: eccentric ball valve.

1. The fluid resistance is small, and the resistance coefficient is the same as that of the same length.

2. Simple structure, small size and light weight.

3. Close and reliable, the sealing material of the ball valve is widely used in plastic and sealing, and has been widely used in vacuum system.

4. Easy to operate, open and close quickly, from open to close just rotate 90 °, is advantageous for the remote control.

5. Easy to maintain, simple structure of ball valve, the sealing ring is generally active, it is convenient to remove and replace.

6. Wide application range, ranging from small to several millimeters, large to several meters, high vacuum or high pressure can be applied.

Mine high pressure ball valve is commonly used this kind of valve for the existing mine commonly used high pressure ball valve, its pressure is high, the way U card fast, in daily production used in coal mine can realize fast installation and disassembly, easy to use.

The discharge ball valve is mainly used in the pipeline to cut, distribute and change the flow direction of the medium.

Discharge ball valve can be divided into: the form of the structure of floating ball type, fixed type, elastic ball type ball. Discharge ball valve is mainly used to truncate or on line in the medium, can also be used for flow regulation and control, discharge ball valve compared with other type valve, the Angle of schedule output torque, start quickly, stable and reliable, and widely applicable.

The discharging ball valve works by rotating the valve to open or block the valve.

The electric ball valve construction is composed of only a few parts, the data consumption province;

Small volume, light weight, small installation size electric ball valve structure, small drive moment, pressure regulating valve, easy to operate, agile, only need to rotate 90 ° can rapid opening and closing;

Besides, it also has good flow regulation effect and sealing characteristics. In the application category of medium and low pressure, electric ball valve is the dominant valve situation.

Electric ball valve is in full open position when the butterfly plate thickness is the only resistance when the medium flows through the body, so by what happens to the valve pressure drop is small, so it has good flow control characteristics.

The electric ball valve has two kinds of sealing type, namely, the bomb seal and the metal seal.

Elastic seal valve, sealing ring can be embedded in valve body or attached to the butterfly plate.

Metal sealed valves are generally longer than those with flexible seals, but it is difficult to fully seal them.

The metal seal can adapt to the higher working temperature, the elastic seal has the temperature limit.

If the request electric ball valve is used as flow control, it is important to select the size and type of valve accurately.

The construction principle of the electric ball valve is especially suitable for manufacturing large diameter valves.

Electric ball valves are not only widely used in petroleum, gas, chemical, water treatment and other general industries, but also used in the cooling water system of thermal power stations.

The commonly used electric ball valve has two kinds of electric ball valve and flange type electric ball valve.

Wafer electric ball valve is made of stud bolt connecting the valve in place between two pipe flanges and flanged electric ball valve is the valve flange, bolts on the valve flange connection on both ends on the pipe flange.

The strength of the valve refers to the ability of the valve to be subjected to medium pressure.

Valve is a mechanical product that is subjected to internal pressure, and therefore must have sufficient strength and rigidity to ensure long-term use without rupture or deformation.

Pneumatic ball valve is composed of ball valve pneumatic actuators, pneumatic actuators are divided into double-acting pneumatic actuators and single-acting pneumatic actuators, controlled by electromagnetic valve, ball valve switch action.

The pneumatic ball valve can realize intelligent control, quickly open or close the pipeline, and can effectively control and manage the pipe network.  

 


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    Address:Port City Of Shamen Town, Yuhuan County, Taizhou City, Zhejiang Province, China

    Contact:Amy Hou

    Mobile:+8618906570891 

    E-mail:amy@brass-valve-machine.com

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