LKB-F Butterfly Valve

ABS offers this special flange version of the LKB butterfly valve that makes it easy to remove the valve body without needing to dismantle piping set-ups. This in turn makes it easy to undertake repair, service and replacement with a bare minimum of disruption.

Related Industries:

Agriculture Processing, Processed Foods, Home and Personal care, Beverage Processing

Full range, full spectrum

The Alfa Laval LKB butterfly valve range consists of modular units designed to meet the full spectrum of requirements at working pressures from full vacuum to 10 bar. All valves are FDA-compliant, designed for use in a wide range of stainless steel pipe systems, and can be built to comply with virtually any installation standard. Alfa Laval LKB-F for flange connections to easily remove the valve body without dismantling piping setups. For both ISO and DIN.

Reliable performance

LKB-F butterfly valves come with several features that ensure reliability performance. A highly polished stainless steel disc with surface smoothness down to Ra<0.8 µm and bearing bushes clipped onto the disc stems prevent metal-to-metal abrasion and ensure smoother disc movement.

The stem diameter provides particularly low flow resistance, ensuring gentle product treatment for low and medium-viscosity products. In addition, Alfa Laval seal technology provides greater thermal stability, better chemical resistance and improved tensile strength.

Manual or automated control

Alfa Laval LKB-F butterfly valves can be complemented with lockable handle for manual operation of with an actuator and in combination with either a valve indication unit or Alfa Laval ThinkTop valve sensing and control units.

For manual operation: Alfa Laval provides a complete range of handles, including a multi-position lockable handle.

For automated operation: A selection of different actuators is available; special double-spring design enables application of maximum torque to the valve disc at breakaway and seal positions. This makes it easy to integrate these valve units into larger systems operated from a central point, and/or to operate them automatically for maximum efficiency.

Concept
The LKB range are hygienic butterfly valves for use in stainless steel
pipe systems.

Working principle
LKB is either remote-controlled by means of an actuator or manually operated by means of a handle. The actuator is made in three standard versions, normally closed (NC), normally open (NO) and air/air activated (A/A). The actuator is designed so that an axial movement of a piston is transformed into a 90° rotation of a shaft. The torque of the actuator is increased when the valve disc contacts the seal ring of the butterfly valve. The handle for manual operation mechanically locks the valve in its open or closed position. The handles for the valve sizes DN125 and DN150, which are designed for locking in two intermediate positions, enable adjusting of the valve, so that the flow rate can be regulated.

TECHNICAL DATA
Valve
Max. product pressure: . . . . . 1000 kPa (10 bar)
Min. product pressure: . . . . . Full vacuum
Temperature range: . . . . . . . . -10°C to + 140°C (EPDM)
However max. 95°C when operating
the valve

Actuator
Max. air pressure: . . . . . . . . . 700 kPa (7 bar)
Min. air pressure, NC and NO: 400 kPa (4 bar)
Temperature range: . . . . . . . . -25°C to +90°C
Air consumption (litres free air) –
ø85 mm: . . . . . . . . . . . . . . 0.24 x p (bar)
Air consumption (litres free air) –
ø133 mm: . . . . . . . . . . . . . . 0.95 x p (bar)
Weight: . . . . . . . . . . . . . . . – ø85 mm: 3 kg.
– ø133 mm: 12 kg.
OC TOB E R 2008

PHYSICAL DATA
Valve bodies
Product wetted steel parts: . . .1.4307 (304L) or 1.4404 (316L)
Disc: . . . . . . . . . . . . . . . . .1.4301 (304) or 1.4404 (316L)
Other steel parts: . . . . . . . . .1.4301 (304)
Rubber grades: . . . . . . . . . .Q, EPDM, FPM, HNBR1) or PFA2)
Bushes for valve disc: . . . . . .PVDF
Finish: . . . . . . . . . . . . . . . .Semi-bright
1) LKB-F with HNBR not available in DIN
2) LKB-F with PFA not available

Actuator
Actuator body: . . . . . . . . . . .1.4307 (304L).
Piston: . . . . . . . . . . . . . . . .Light alloy (for ø85 mm:
Bronze) Air/air version
Seals: . . . . . . . . . . . . . . . . .NBR

Standard design
LKB is available in three versions, LKB for ISOand DIN tubes, LKB-2 for DIN tubes and LKB-F for flange connection. The valve consists of two valve body halves, valve disc, bushes for the disc stem and seal ring. LKB-F also consists of two flanges and two flange seal rings. The valve is assembled by means of screws and nuts. Two actuator sizes, ø85 mm and ø133 mm, cover all valve sizes. The actuator is available in two versions, LKLA and LKLA-T. The actuator is fitted onto the valve by means of a bracket and screws. (The actuator can also be fitted onto ball valves by means of special brackets). The handle for manual operation is fitted onto the valve by means of a cap/block system and a screw. The valve has welding ends as standard, but LKB and LKB-2 can also be supplied with fittings.

Options
A. Male parts or clamp liners in accordance with required standard.
B. ThinkTop® for control and indication.*
C. Indication unit with micro switches.*
D. Indication unit with inductive proximity switches.*
E. Indication unit with Hall proximity switches.*
F. Explosion proof indication unit with inductive proximity switches.*
G. Bracket for actuator. (Also for ball valves).
H. Handle with two or four positions (standard on DN125 and DN150).
I. Handle for electrical position indication.
J. Handle with infinite intermediate positions (not for DN125 and
DN150).
K. Multipositioning handle**.
L. Lockable Multiposition Handle. Padlock can be mounted as shown
in fig. 3.
Note! Padlock is not delivered.
M. Special cap for 90° turned handle position.
N. Service tool for actuator.
O. Service tool for fitting 25-38 mm (DN25 – DN40) valve discs.
* For further information see Product Catalogue chapter “Control
& Indication”.
** A padlock can be mounted on the Lockable Multi-position
Handle as shown in the opposite figure.
Note! Padlock is not delivered.