Design characteristics of resilient seated butterfly

Connecting Flange of Drive:
Applicable for manual, worm gear, electric and pneumatic connection devils (2"—24" lo
ISO5211)
Bushing: used as valve stem support, positive shaft correction and brake support. There are bushings of low friction coefficient at the two ends of stem to reduce the frictional force of stem and open-close torque of valve.

Disc: Streamlined design of disc, the upper and lower stem ends in close contact with the seat to avoid medium leaking from the stem surface accurate disc ex-circle in precise match with the seat to ensure low open -close moment of valve and long service life of seat under the state of sealed. The shape of disc differs from the type of connection to the stem, and the flow coefficient of valve is closely associated with the structural type of disc.

Valve body, classified to the following according to structural types:
1. WS -four -lug shaftless body, applicable for DN50-DN600
2. WL-lugless body, applicable for DN50-DN300
3. WF -single reinforcement body, applicable for DN550-DN1200
4. WU -Unthreaded body, applicable for DN700- DN1200
5. LL-Lug wafer body, applicable for DN500-DN600
6. LU-U screw body, applicable for DN700-DN1200
7. TH-threaded body, applicable for DN50-DN150
8. GR-clamped body, applicable for DN650-DN300

Connection Structure of Stem Head:
According to the difference in driving mechanism, there may be key connected, opposite flat or square (flat or square applicable for 2"-24").

Stem seal: sealing material may be soft graphite. PTFE or rubber (O-ring) according to working conditions and medium.
.
Stem: for DN<24", stem is one-shaft structure; for DN>24",stem is segmental (upper and lower shafts) structure. Stem and disc are connected by pin to guarantee the accurate position of disc switch.

Pin: to guarantee vibration protection and the connection between shaft and disc, there are three types of connection between stem and disc.
1. Taper pin connection, applicable for DN50-DN1200.
2. Semi-shaft pinless connection, application for DN50-DN600.
3. Total-shaft pinless connection, application for DN50-DN300.

Seat: non-expansion, resistance against expansion and breakage. Pressure mould soft sealing material. The dovetail groove on the seat in contact with the body to ensure the seal between the seal and body, and that the connecting gasket to flange can be omitted. For repair, just replace the seat directly, thus to improve the service life of valve.
The structural types of our butterfly valve seat:
1. Dovetail Seat 2. Cylindrical Seat
3. Shoe-type Seat 4. Vulcanized Seat

 

 

上一篇：Tripe Eccentric Buterfly Valve  
下一篇：No data