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Specifications

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A:The maximum permissible leakage of the valve with non-metal elastic seals is zero, and that of the ball valve with meal seals is
0.1xDNmm3/S. Therefore, acceptable valves with metal seals possibly have slight leakage. So, in the applications where must not be any leakage, especially at the pipeline ends, ball valves with soft seals should be used.
B If the ball valve with pipe thread connection is connected with the pipe threads on the pipe end, its female thread may be parallel or tapered one, but its male thread must be tapered type. When installing the valve, it is necessary to clamp the hexagonal or octagonal position on the same side as its thread instead of the hexagonal position on the other end of the valve, so as to prevent the valve deforming.
C Nominal pressure of brass ball valve is 1.6MPa, 2.5MPa, 4.0MPa, the temperature is -20°C~120°C. When the valve is used for saturated steam. The pressure of the saturated steam should be ≤0.6MPa.
DTo increase the service life of a ball valve, it should be full opened or closed instead of partial opening for throttling purpose, as when it is partially open, the flowing medium will erode the ball and sealing
surface and thus affect the sealing performance of the valve

ball valve handles specification

Main Parts Materials:

Factory envrionment:

1.Indication of valve’s open and close positions

1.block-up and excretion

when the valve is in the closed state, the seat ring on the upstream and downstream sides cuts off the fluid and the accumulated matters in the middle cavity of the body can be excreted. The excreting device features the following functions.

1).can check if the seat ring leaks or gets damaged beforehand.

2).reduce pollution to the valve due to the medium replacement.

3).the packing on the stem portion can be re4placed when the valve is the fully opened or closed state under the working pressure.

2.automatic pressure discharge

when an abnormal pressure rise occurs with the medium stayed in the middle cavity of the valve due to rising temperature, the seat ring will come off form the ball and automatically discharge pressure or the safety valve mounted on the body ensures the system safety.

3.complete seal
the unique sealing mode of the ball valve makes the fluid completely cut off.

4.fire-fighting structure
if the Teflon seat ring is made softened and burnt in case of a fire or an abnormal temperature rise, the valve can be still reliably operated to prevent the fire from expanding and the seat ring’s support can be contacted with the ball to act as an instantaneous seal, conforming with API607.

5.Electrostatic-proof structure
during valve operation, the friction between the ball and the PTEE seat ring will produce electrostatic charges and they
will be accumulated onto the ball. To prevent electrostatic spark from being produced, an electrostatic-proof device is mounted on the valve, which can guide the charges out through the electric path formed by both ball and body via the spring.

6. structure of seat ring
Two kinds: single seal and dual seal . In general, those of an automatic pressure discharge function are single seal while the dual seal means the additional safety pressure discharge to the body.For the seat ring of the single seal structure, it depends on, after being inlaid into the support ring , the spring’spre-tightening force and the piston effect to have both set ring and ball pressed tightly so as to form sealing. When an abnormal pressure rise occurs inside of the middle cavity of the body due to some reason, the seat ring will automatically discharge the pressure under the action of pressure differential to prevent any danger from happening,then after discharging the pressure it is reset automatically.

For the dual seal structure formed with the supports of both dual seal structured seat ring and O ring, both seat ring and ball are made contacted under the spring’s pre-tightening force and sealed under the pressure differential on the upstream (downstream) side of the pipeline and the middle cavity of the body, regardless of on which side the medium’s pressure is higher, both spring’s pre-tightening force and piston effect make the seat rings on both upstream and downstream sides always tightly contacted with the ball to completely cut off the fluid and prevent leak even if any one of them gets damaged, however there is no automatic pressure discharge function, so a pressure discharger has to be mounted in the middle cavity of the body to avoid abnormal pressure rise therein.

7. structure of seat ring
Two kinds: single seal and dual seal . In general, those of an automatic pressure discharge function are single seal while the dual seal means the additional safety pressure discharge to the body.For the seat ring of the single seal structure, it depends on, after being inlaid into the support ring , the spring’spre-tightening force and the piston effect to have both set ring and ball pressed tightly so as to form sealing. When an abnormal pressure rise occurs inside of the middle cavity of the body due to some reason, the seat ring will automatically discharge the pressure under the action of pressure differential to prevent any danger from happening,then after discharging the pressure it is reset automatically.

8. full or reduced diameter
Three piece ball valve nominal diameter is identical to the inner diameter of the pipeline (which can be reduced one if so required by users) for the sake of cleaning.

9.locker
use a locker to fix the valve so as to prevent maloperation of it and keep it in the correct opened or closed position.

10.extension of stem
extension of the stem is suitable for use under-ground and at low temperature, the extended size is depended on the necessity and the operation mode can be manual, pneumatic, electric, gas-hydraulic jointed or hydraulic actuation, also upon the necessity.

11. the relative sliding portion (seat ring and stem bearing ) of a large aperture ball valve has a small operational torque due to its use of Teflon which has a small friction coefficient and can be flexibly operated for a long time even if there is no lubrication supplied for it.

12.different actuation modes
Three piece ball valve used different and effective actuation modes include manual, pneumatic, electric, hydraulic and gas-hydraulic jointed ones.

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What is a valve?

Mary:A valve is a device that regulates the flow of a fluid (gases, fluidized solids, slurries, or liquids) by opening, closing, or partially obstructing various passageways. The majority of valves are used in water reticulation, sewerage, oil and gas, power generation, mining, and chemical manufacturing.

Ball valves are durable and usually work to achieve tight shutoff even after years of disuse. They are therefore an excellent choice for shutoff applications.

How many types of valves are used to control the flow of fluids?

Mary:Valves can be categorized into the following design types, and although there are hundreds of variations, most of valves fit into these basic types:

* Ball valves, used for on/off control without pressure drop.

* Butterfly valves, used for flow regulation in large pipe diameters.

* Choke valve, used for high pressure drops found in oil and gas wellheads.

* Check valve, allows the fluid to pass in one direction only.

* Diaphragm valve, some are sanitary predominantly used in the pharmaceutical and food industry.

* Gate valve, mainly used for on/off control, with low pressure drop.

* Globe valve, good for regulating flow.

* Needle valve, used for accurate flow control.

* Piston valve, used for regulating fluids that carry solids in suspension.

* Pinch valve, used for slurry flow regulation.

* Plug valve, slim valve used for on/off control but with some pressure drop.

What is a sanitary valve?

Mary:A sanitary valve is designed for use in applications requiring clean or sterile processing. Sanitary valves are commonly used in dairy, food, pharmaceutical, medical, and chemical applications. Their common features include easy cleaning, crevice free, and polished contact surfaces.

Important specifications when considering sanitary valves include diameter, working pressure, and operating temperature. The diameter is measured across the inlet or outlet port. The working pressure is the pressure at which the valve is designed to operate. The operating temperature is the full-required range of ambient operating temperature. Media types that sanitary valves can be configured to work with include gases, liquids, and liquids with suspended solids. The material temperature is the range of temperature that the valve can withstand and still function properly. This relates to the media being transported, not the ambient or operating temperature outside of the system.

What is a check valve?

Mary:A check valve is a valve normally allows fluid (liquid or gas) to flow through it in only one direction. Check valves have two openings in the body, one for fluid to enter and the other for fluid to leave. There are various types of check valves used in a wide variety of applications.

Check valves work automatically and most are not controlled by a person or any external control; accordingly, most do not have any valve handle or stem. They are operated by the flow of fluid in the piping. The bodies (external shells) of most check valves are made of plastic or metal.

How to install a valve?

Mary:Whenever you are going to install a valve, be sure you know the function the valve is going to perform - that is, whether it must start flow, stop flow, regulate flow, regulate pressure, or prevent backflow. Inspect the valve body for the information that is stamped upon it by the manufacturer: type of system (oil, water, and gas), operating pressure, direction of flow, and other information.

You should also know the operating characteristics of the valve, the metal from which it is made, and the type of end connection with which it is fitted. Operating characteristics and the material are factors that affect the length and kind of service that a valve will give; end connections indicate whether or not a particular valve is suited to the installation.

When you install valves, ensure they are readily accessible and allow enough headroom for full operation. Install valves with stems pointing upward if possible. A stem position between straight up and horizontal is acceptable, but avoid the inverted position (stem pointing downward). If the valve is installed with the stem pointing downward, sediment will collect in the bonnet and score the stem. Also, in a line that is subject to freezing temperatures, liquid that is trapped in the valve bonnet may freeze and rupture it.

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