How to repair when V-type ball valves have the leakage?

V notch port ball valves where possible leaks are common: packing leak after leak gland, flange leak, the leak was sealed between the seat and the V notch port ball valves, actuator leaks and so on. V notch port ball valve leaks are causing the ball run, run, drip, leak phenomenon in which, V notch port ball valve leak is a very serious problem, if not pay attention caused easily lead to accidents, here I plant engineers generated from these leakage causes and solutions should be taken two ways to explain this line:

A phenomenon: V notch port ball valves packing leak.
Analysis: V notch port ball valves may be because the padding bolts not pressed;
Solution: Under normal circumstances rather tight V notch port ball valves packing gland nut can be solved V notch port ball valves packing leak problem.
Causes: V notch port ball valve operation result of the use of V notch port ball valves filling out the wear and tear;
Solution: Remove the V notch port ball valves packing cover, replace the V notch port ball valves packing.
Phenomenon II: V notch port ball valves gland leak
Causes: O-ring damage;
Solution: Replace the O-ring.
Three phenomena: V notch port ball valves flange leaks
Causes: V notch port ball valves flange gasket loses its elasticity;
Solution: Replace the flange gasket.
Analysis: flange gasket dislocation;
The solution: re-flange gasket sealing surface placed in position.
Phenomenon four: V notch port ball valves seat outside the test leak was sealed
Causes: O-ring or a graphite ring damage;
Solution: Replace O-ring or a graphite ring.
Phenomenon V: V notch port ball valves was sealed between the spool and seat leakage
Analysis: closing the actuator does not reach 90 degrees;
Solution: Adjust the actuator stroke so that it can complete in a fully closed state.
Analysis: sealing surface wear;
Remedy: Remove the V notch port ball valves seal seat, remove the ball, sealing seat and plug polished repair. If the V notch port ball valves seal seat badly damaged, replace the V notch port ball valves seal seat.
Phenomenon Six: V notch port ball valves pneumatic actuator leak.
Causes: O-ring damage is serious;
Solution: Replace the V notch port ball valves O-ring.

Should you want to know more about ball valve , such as trunnion ball valve from Reliable China valve manufacturer, please visit www.reliavalve.com or email us via sales@reliavalve.com.

original:How to repair when V-type ball valves have the leakage?

What is flange ends V-type ball valves and pipe connections ?

Flange ends V-type ball valve is a ball valve V-type connected with the pipe through the flange, with its relatively corresponding V-type ball valve is threaded and welded V-type ball valve.

Flange is an important way to connect pipeline construction, flange (RF), also known as RF,RTJ or FF, flanges are connected to each other between the valve and the pipe, tube and pipe parts for pipe end The connection between; it is the two pipes, fittings or equipment attached to each one of the flanges, flange gasket between the two flanges together with bolted together to complete the connection, but sometimes Some fittings and valves has been carrying flange, also belong to the flange connection, flange connection V-type ball valves are easy to use, able to withstand greater pressure on industrial pipe flange V-type ball valve use more widely, because Industrial pipe diameter is relatively large, and it is relatively large pressure.

V-type ball valve and pipe connections .
Select the connection V-type ball valve with the line or between devices is right and proper, it will directly affect the V-type ball valve generation run, run, drip, drain phenomenon of probability.
V-type ball valve connections include: flanged, wafer, welded connections, threaded connections, sleeve connections, clamp even
First, Flange ends V-type ball valve
V-type ball valve at both ends with a flange, and the flange on the corresponding pipe, installed in a pipe bolted flange. V-type ball valve flange connection is the most frequently used form of connection. There flange raised face (RF), plane (FF), convex and concave surfaces (MF) and other points. Press the combination of surface shape can be divided into the following categories:
1)Smooth style: not for high pressure valves, processing more convenient.
2)Lenticular: higher working pressure, can be used in hard-washer.
3)Tenon slot: Available plastic deformation larger washers use in corrosive media is more extensive and better seal.
4)Trapezoidal trough: oval metal ring gasket for use in the working pressure ≥64 kg / cm of valves, or high temperature valves.
5)Lens type: washer lens shape, made of metal. For operating pressure ≥100 kg / cm high pressure valves, or high temperature valves.
6)O-ring type: This is a relatively new form of flange connection, it is with the emergence of a variety of rubber O-ring, and developed, it is generally flat washers reliable sealing effect on the ratio.
Second, the clip connection V-type ball valve.

Wafer V-type ball valve mounted on two intermediate flanges, the body often have locating holes for easy installation location, directly through the V-type ball valve and pipe connection in the form of two clamped together with bolts.
Third, the welded connection V-type ball valve.
1)Welded connections: V-type ball valve ends by butt welding butt groove processed into the corresponding groove and pipe welding, pipe fixed by welding.
2)Socket weld: V-type ball valve socket weld ends according to the requirements of the processing, and pipeline socket weld connections.

Should you want to know more about ball valve, such as trunnion ball valve from Relia Valve, please visit www.reliavalve.com or email us via sales@reliavalve.com.

original:What is flange ends V-type ball valves and pipe connections ?

How to adjust the pneumatic V-type ball valves?

Pneumatic V-type ball valve is composed of two parts,V-type ball valve and pneumatic actuators consisting of pneumatic V-type ball valve of regulation primarily by pneumatic actuators to achieve, how it is possible? Here,we will detail the process of its implementation:
Pneumatic actuator is driven by the actuator portion which receives the pressure signal electric / pneumatic valve transducer (or electric / pneumatic valve positioner) output and converts it to the corresponding linear displacement of the plunger to push adjusting means.
Pneumatic actuator can be divided into film, piston, rolling diaphragm, rotary vane and other types. Among them, the first three belong to linear actuators, their testimony compressed air power component in linear motion, power unit rotary vane actuator testimony in compressed air rotary motion, is typical of rotary pneumatic actuator.

1. The pneumatic diaphragm actuator for the V notch ball valve.
This executive body more commonly, it is characterized by simple, inexpensive, reliable operation, easy maintenance; not the positioner, the spring can be realized only rely on the implementation of proportional action; when the air supply is interrupted, the pusher automatically returns without signal position, and is equipped with V-type ball valve, can provide a source of security role off the production. But its output stroke is small, it can only accept a lower operating pressure, the maximum pressure is generally 0.25 ~ 0.4MPa, only direct drive V-ball valve stem, therefore, mainly used for general pneumatic regulating valve V-type push devices.
Pneumatic diaphragm actuator can be divided into two types of spring and without spring, there are two kinds of action and reaction mode of action. As shown, when the film-forming chamber gas pressure increased, V-type ball valve stem direction to extend the action film chamber positive-acting actuators, the direction of movement back into the film chamber is reaction type. Different modes of action of the actuator for the V-type ball valve varieties constitute the open air and gas off two functions provided for convenience only. The practical application of the film are the property of pneumatic actuators with spring type of execution, no spring is seldom used.

Now there is a spring in the usual positive-acting pneumatic diaphragm actuator explain the structure and role of the principle. When the signal pressure through the membrane cover 1 and 2 consisting of corrugated diaphragm chamber to produce a thrust on the diaphragm, the push rod 5 downward and the compression spring 6, when the spring force and the signal When the thrust generated by the pressure on the diaphragm balanced, stable putter in a corresponding position, the push rod actuator displacement output is also known as stroke. This actuator is the ratio of the output characteristics, the output displacement and input signal proportional to the pressure.

Pneumatic diaphragm actuator stroke specifications are 10, the effective area of ​​the diaphragm and other 16,25,60,100mm have 200,280,400; 630,1000,1600c resistance of six specifications, the greater the effective area, the greater the thrust actuator.

Should you want to know more about ball valve, such as metal seated ball valve from Relia Valve, please visit www.reliavalve.com or email us via sales@reliavalve.com.

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