» Products » Split Body PTFE Lined Wafer Butterfly Valve

Split Body PTFE Lined Wafer Butterfly Valve

A series of split body fully PTFE lined wafer type butterfly valves supplied to Santiago, Chile; ductile iron body and double-half-shafts design; designed to BS 5155; worm gear operated.

  • Description

G.A. Drawing & Design Features

G.A. drawing of split body BFVs

A typical G.A. drawing for split body universal wafer type butterfly valves, fully PTFE lined and lever operated, single through shaft design.

Design features: (1) Split body design: The PTFE liner is sandwiched between two body halves and bolted together. This design allows for easy removal of the lining after it becomes worn. (2) Fully lined design: The composite soft seat is made of EPDM rubber and PTFE lining. The EPDM rubber held in place by the body provides sufficient elasticity as sealing load, while the PTFE lining in contact with the fluid provides superior corrosion resistance. The disc is PTFE encapsulated. The PTFE-on-PTFE seating surfaces make for a very tight shutoff in low-pressure-drop applications and elevated temperatures. (3) Suitable for multiple types of flange connection. (4) Thrust washers are placed on both sides of the disc, between the disc and the body, to keep the disc firmly centered with the seat.

Design Standards, Working Temperatures & Pressure Ratings

Fully PTFE lined BFV, Al handle

A fully PTFE lined wafer butterfly valve with aluminum handle, double half shafts and split body design.

The split body fully PTFE lined wafer type butterfly valve can be designed and manufactured in accordance with MSS SP 67, API 609, BS 5155, EN 593, or DIN 3202. Due to the incorporation of PTFE linings, the working temperature range can be -10°C to 250°C. Pressure ratings available are Class 125, Class 150, PN 10, and PN 16.

Material Selection & Structural Dimensions

worm gear operated PTFE lined BFV

A worm gear operated fully PTFE lined butterfly valve, wafer type, double half shafts design, supplied to Durban, South Africa.

Item No.Main PartMaterial
1Lower BodyCast Iron, Ductile Iron
2ShaftSS 416, SS 431
SS 304, SS 316
3SeatEPDM+PTFE
4DiscD.I. + PTFE
5Upper BodyCast Iron, Ductile Iron
6BushingPTFE, Bronze
7O-RingEPDM, Viton
8BushingPTFE, Bronze
9HandleMalleable Iron
*Materials for main parts of the split body wafer butterfly valve.

NPSA
mm
B
mm
C
mm
L
mm
1-1/2“681102433
2”801613042
2-1/2“891753045
3”951813045
4“1142003051
5”1272133055
6“1392263055
8”1752603460
10“2032923467
12”2423373476
14“2673684076
16”31640052102
18"33442252114
20"37048064127
22"43353370151
24"46856270151
*Dimensions: A, B, C, and L for sizes from 1-1/2″ to 24″. For larger sizes, please contact us.

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