Alfa Laval LKB Range Butterfly Valve

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.

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.

Fig. 1. Lockable Multiposition Handle with padlock.
1.Padlock

 

 

Fig. 2. Dimensions – padlock.
A. Min. 20 mm
B. Min. 35 mm
C. ø6 mm

Fig. 3. Positioning cap.
1. On/Off
2. Multi positioning

Capacity/Pressure drop diagrams

LKB and LKB-F fully open

LKB-2 and LKB-F fully open

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 Multiposition Handle as shown in the opposite figure. Note! Padlock is not delivered.

Note!For further details, see also ESE02446

Torque diagrams – Actuator

A = 6 bar air pressure
B = 5 bar air pressure
C = Closing/opening with spring
D = 6 bar air pressure connection on top
E = 6 bar air pressure connection on bottom
F = 5 bar air pressure connection on top
G = 5 bar air pressure connection on bottom

Alfa Laval recommends actuator size ø133 for ≥ 101.6/DN100

Torque values (for rotating the valve disc in a dry seal ring)

Valve Dimensions (mm)

Fig. 1. Dimensions – valve.

 

Fig. 2. Dimensions – actuator

Dimensions (mm) – Valve LKB, LKB-2, LKB-F:

NOTE! Weights are for valves with welding ends and handles.

Dimensions (mm) – Actuator LKLA and LKLA-T:

Connections
Compressed air
R1/8″ (BSP), internal thread.