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Ball Valve Seal Performance Check
Jul 13, 2017

Ball valve can be divided into 19 categories, there are floating ball valve, fixed ball valve, metal hard seal ball valve, V-type ball valve, clip ball valve, ball valve insulation, pipeline ball valve, ball valve, Three-way (four-way) ball valve, internal thread ball valve, integral ball valve, low temperature ball valve, bellows ball valve, eccentric hemisphere valve, all welded ball valve, special ball valve.

O-type ball valve with floating structure, the core for the precision castings, the appearance of hard chrome plating, the valve seat with metal or reinforced PTFE material, flow channel and pipe diameter the same, great circulation, flow resistance is very small, close No leakage, the general use of open and close valve, especially for high viscosity, including fiber, granular media. V-type ball valve with a fixed structure, the ball on the V-shaped incision, can achieve proportional adjustment, flow characteristics for the approximate percentage. The same time as the above-

Ball valve for a wide range of applications, the ball valve can be applied to:

1, nominal diameter from 8mm to 1200mm. The same time as the above-

2, nominal pressure from vacuum to 42MPa. The same time as the above-

3, the working temperature from -204 ℃ ~ 815 ℃. The same time as the above-

Especially in the oil, chemical, metallurgical and other departments, in the flammable, explosive media equipment and piping systems using soft sealed ball valve, should pay attention to fire and fire.

In general, in the double-position adjustment, strict sealing performance, mud, wear, necking channel, opening and closing action quickly (1/4 turn open), high pressure cut off (large pressure), low noise, cavitation and gasification, It is recommended to use ball valves in small piping systems where the atmosphere is small and the operating torque is small and the fluid resistance is small. The same time as the above-

Ball valve is also suitable for light structure, low pressure cut off (small pressure), corrosive media pipeline system. The same time as the above-

Ball valves are also available in low temperature (cryogenic) and piping systems. The same time as the above-

When a regulatory performance is required, a ball valve with a special structure with a V-shaped opening is required. The same time as the above-

In the oil, petrochemical, chemical, power, urban construction, the working temperature of 200 ℃ above the pipeline system can be used metal-sealed metal ball valve. The same time as the above-

In the metallurgical industry, the oxygen pipeline system, the need to use a rigorous degreasing treatment of the ball valve. The same time as the above-

In the pipeline and gas pipeline in the main line to be buried in the ground, the need to use full diameter welded ball valve. The same time as the above-

Ball valves are widely used in irrigation systems and are used primarily in branch pipes. Ball valve structure is simple, small size, the resistance to the flow is also small, the disadvantage is to open or close too fast, will produce water hammer in the pipeline (pipe flow rate suddenly changes in pressure will rise). So the trunk should not be used in the ball valve, can be used in the dry, branch or its end for the use of red, flushing sewage effect is good.

Ball valve installation

First, the preparation before installation

1, the ball valve before and after the pipeline is ready. Before and after the pipeline should be coaxial, two flange sealing surface should be parallel. Pipes should be able to withstand the weight of the ball valve, otherwise the pipe must be equipped with appropriate support.

2, the valve before and after the pipeline clean, remove the pipeline of oil, welding slag and all other impurities.

3, check the ball valve logo, identify the ball valve intact. The valve fully open all closed several times confirmed that its work is normal.

4, remove the ball valve at both ends of the connection flange on the protection.

5, check the valve hole to clear the dirt may be, and then clean the valve hole. Even if only small particles of foreign matter between the valve seat and the ball may damage the valve seat sealing surface.

Second, the installation

1, the valve installed on the pipeline.

Any one end of the valve can be mounted on the upstream side. The valve that is driven by the handle can be mounted on any position on the pipe. But the ball valve with gearbox or pneumatic actuator should be installed upright, that is, installed on the horizontal pipe, and the drive device is above the pipe.

2, the valve flange and the pipeline between the flange design requirements installed on the gasket.

3, the flange on the bolt to be symmetrical, successive, uniform tightening.

4, connect the pneumatic line (when using the pneumatic drive).

Third, after the installation of the inspection

1, the operation of the drive Kai, closed the ball several times, should be flexible without stagnation, confirmed that its work is normal.

2, according to the pipeline design requirements of the pipe and the ball valve between the flange surface sealing performance inspection.





Yuhuan Sinpo Valve Co.,LtdTel: +86-576-89903137