Description for Full weled ball valve
Structural characteristics and advantages for Full weled ball valve:
1. Anti-leak stem
In order to prevent the stem fly cause abnormal elevation of internal pressure valves, dry shoulder fixed lower portion. Further, in order to prevent leakage resulting from burnout stem packing in a fire, the thrust bearing in the lower portion of the contact position in the stem and body shoulders therefore prevent the formation of anti-sealing seat leakage to avoid accidents.
2. Fire safety structure
When the trunnion ball valves normal use, the seat and the spherical stamp law, seat retainer o-ring and seal body, which is a soft seal, reliable seal and o-ring seat when injured, seat holder and the body will be stamped expanded graphite such behavior fire safety purposes.
3. Anti-static equipment
In order to prevent friction among ball, stem and PTFE static electricity may ignite flammable materials and explosives, resulting in an accident, in this ball valve, static-conduction spring between the stem and the ball, the stem and the body and therefore static ground system security to be secured.
4. Free body leaking seal structure
Smooth, double stamped gaskets and o-rings, on this basis, for this reason as fire switch position of the valve and the valve bonnet, high temperature, shock and uneven opening or closing torque will not cause external leakage.
5. Low operating torque
Self-lubricating bearings installed in the friction of stem cells, leading to wear and flexible operation and low torque.
6. double block bleed (DBB)
When the ball fully open or closed position, the transmitter substance the body can drain cavity Center announced, emptying devices Moreover, it is the center of the valve chamber pressure can be released into the low pressure end of his rescue seats.
7. Emergency sealing
Composite injection hole design and install complex injection valve located in the stem / hat and physical support when the valve stem seal or seat damage induced leakage, such compounds can be used to make a second check valve seal hidden installed near both composite injection valve, to prevent the outflow of action of the compound material, a composite of the top of the transmitter composite fuel injection valve of fast connection connector injection gun.
8. stem extension
Underground installation valve stem can be extended to facilitate the operation corresponding composite nozzle, the drain valve can be extended to the highest valve.
9. Automatic body cavity relief
When the body pressure rise is not normal, such as instability, trunnion ball valve downstream seat will be normal pressure, while not normal automatic release of pressure, do not damage the sealing of upstream seat.
Material list and dawing for Full weled ball valve:
Please note: please check our catalog in this page or the home page in our Web site.