Commonly used V notch ball valve connection type flange end V notch ball valve and wafer V notch ball valve , seal type soft seated V notch ball valve and metal seated V notch ball valve.
V notch ball valve is generally made of carbon steel or stainless steel casting, there are some ceramic sintering, but the high cost of the ceramic body and not easy to process, so in addition to those for corrosion and wear particularly demanding situations, generally have little use. O-type ball valve general assembly in order to facilitate trim and valve body into several parts good, but V notch ball valve inner parts, especially the ball valve core is smaller than O-type ball valve is relatively easy to assemble; it is generally We have adopted the unitary body.
V notch ball valve stem in the ball core separates into two sections. The stem is connected to the actuator, the actuator will transmit the rotation of the ball core, controls the opening of V notch ball valve, inserted by the stuffing box installation. The lower stem only from the role of a shaft, which is fixed to the axis of rotation of the spherical core, the installation is generally from the bottom of the body of the insert, and then compress the seal under the cap.
V notch ball valve ball core as part of a sphere, the sphere has a V-shaped notch. Different angular stroke V-notch corresponding to different sizes, different flow area, thereby controlling the flow of fluid. V notch ball valve flow characteristics are generally equal percentage flow characteristics. Edge V-notch is more sharp, with cut feature, you can cut off the fluid inclusions of fiber, so closely with the sealing surface. V notch ball valve ball core typically designed eccentric rotation. Eccentric design, the off time between the ball and the seat are certain core clamping force, is more reliable seal; when you open V notch ball valve ball core can be quickly removed from the seat, reducing the ball core with the valve seat between the friction and wear, to ensure close coordination of the two, extending the service life of V-ball. Sealing surface of the V notch ball valve ball cores generally have been special treatment, the use of high temperature nickel-based alloys or tungsten-cobalt alloy and other hard material at the surface, thus reducing wear and prolong life.
V notch ball valve points soft seal and hard seal (also called metal seated ball valve). During installation, the general seat by a runner into the back and tighten the retainer, a spring between them to prevent loosening. Soft sealing seat in the front seat bracket by pressing the seat retainer bracket to be fixed. Hard seal seat 316 is often used as a base, and then in the vicinity of the sealing surface of surfacing tungsten carbide cobalt chrome to reduce the wear and tear; soft sealing valve is commonly used molybdenum disulphide reinforced polytetrafluoroethylene. You can use an elastic hard sealed seat at high temperatures, with a small amount of plastic deformation at high temperatures to fix the valve seat due to expansion valve stuck ball core issues.
V notch ball valve of stuffing and other parts of the control valve and is not much difference compared to conventional fillers generally are PTFE asbestos, flexible graphite and the like.
Assembly repair should take care to protect the finished surface of the core V-ball ball on the seat, ensure concentricity between the spherical core and the valve seat. Consistent with the direction of fluid flow in the direction of flow indicated by signs installation.
Common V notch ball valve is mainly made up of body, up and down the stem, ball core, seat components, packing components, and some other component parts.
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