Pneumatic Control and Shut-off Butterfly Valve (Type LTR 43)

Triple eccentric Type LTR 43 Control and Shut-off Butterfly Valve
With zero leakage designed for bi-directional service at full
Differential pressure.
Valve body material
Carbon steel
Stainless steel
Special materials
Valve body style
Wafer
Lug-type (valve for dead-end service)
Double-flanged
Welding ends
Seat ring material
316 SS stainless steel/graphite laminated seal
316 SS stainless steel stellited
Filled PTFE
Special materials
The butterfly valves can be equipped with various actuators,
Positioners, solenoid valves as well as other accessories.
Versions
Standard version
Type LTR 43 · Wafer-style butterfly valve conforming to
API 609 and DIN specifications
Other versions
Lug type body conforming to API 609 and DIN specifications
Double-flanged valve body according to BS 5155/ISO 5752
Specifications
Face-to-dimensions according to ANSI B 16.10 and DIN
Fire-safe design conforming to BS 6755 Part 2, API 607 and
API 6FA
Cryogenic version down to 196 ° C
High-temperature version up to +1000 ° C
Alternative materials for valve body and internal parts:
Duplex, bronze, Monel, Incoloy, Hastelloy B and C, titanium
And zirconium
Principle of operation
The process medium can flow through the butterfly valve in both
Directions. The valve flow coefficient depends on the opening
Angle of the disc and the area released between the disc and
Valve body.
The valve is sealed by a metal/graphite laminated seal stack
(seat) inserted in between the body and the metal disc edge
(LTR 43-1) or by the metal seat ring screwed onto the disc
(LTR 43-2). The seat adapts itself to the disc or seat ring. The
Friction forces are minimized by the triple eccentric design of the
Disc and shaft.
Fail-safe position
Pneumatic rotary actuators have two fail-safe positions which
Become effective when the actuator is relieved of pressure as
Well as when the supply air fails:
Valve CLOSED without supply air
The butterfly valve closes when the supply air fails.
Valve OPEN without supply air
The butterfly valve opens when the supply air fails.