I Application

Double butterfly valves can be used in most liquid product applications in the
food-processing, pharmaceutical and chemical industries. The LBV (Leakage Butterfly Valve)
valve offers an easy and safe separatation of products and prevents accidental mixing in
case of gasket failure. The most usual applications are the ones that require safe separation
of the product and CIP solutions in a single point (not in manofolds), or at the end of a
manifold (e.g. CIP return) or entry of a CIP solution into a tank (through a spray ball).

I Operating principle

The LBV valve provides double safety: the two butterflies are simultaneously actuated by
only one actuator.
When the two valves are closed, there is a chamber between them. The chamber is under
atmospheric pressure as it open to the exterior, thus, in case of failure of any of the two
gaskets, leakage of the liquid product will indicate any possible mixing of products.
The state of the gaskets is supervised by means of either of
the leakage detectors.
The other detector (superior) controls the entry of the
cleaning solution to prevent any kind of contamination in the
chamber.
These 2 leakage detectors provide optimal protection and
enable cleaning of the intermediate chamber.

I Design and features

Compact and robust design.
Low pressure losses.
Interchangeable half-bodies (any connection type).
Connections: weld DIN 11850
CLAMP DIN 32676
threaded DIN 11851
weld OD ASME BPE
CLAMP OD ASME BPE

I Materials

Parts in contact with the products                                                            AISI 316L
Other St.St. parts                                                                                          AISI 304
Gasket                                                                                                             EPDM according to FDA 177.2600
Internal surface finish                                                                                 Ra ≤ 0,8 μm
External surface finish                                                                                Machined

I Otions

Gaskets: NBR, VMQ or FPM.
Connections: SMS, RJT, FIL-IDF, etc.
Double-acting pneumatic actuator.
Inductive position sensors.
C-TOP control head (inductive position sensors or microswitches).

I Technical specifications

Available sizes                                                                                           DN 25 – DN 100                                        DN 1″ – DN 4″
Max.working temperature                                                                     -10 ºC to +120 ºC (EPDM)                      14 ºF to 248 ºF
+140 ºC (SIP, max. 30 min)                    284 ºF
Min.working pressure                                                                             0,2 bar (abs. P)                                           3 PSI (abs. P)
Max.working pressure                                                                            10 bar 145 PSI