Connection Of Two Rupture Valves In Installations With Two Cylinders; Rupture Valve Adjusting - OmarLift VP 114 Manual De Istrucciones

Rupture valves VP
Operative instructions
2.2.3

Connection of two rupture valves in installations with two cylinders

In case of installations with two cylinders, each having its own rupture valve, it is necessary to connect the rupture
valves to a power line and to connect together the piloting system of both the valves, to obtain a simultaneous
tripping (see Fig. 2).
The two main power connection branches starting from the three-way fitting until the two rupture valves, must have
the same section and the same length, and must be as symmetrical as possible in order to produce the same pressure
fall.
The two valves are equipped with 1/8" threaded hole which allows their connection and the piloting pressure
balancing.
The connection of the two rupture valves together must be made using a 6 mm steel pipe; it has to be as short
as possible, horizontally oriented, to avoid air bags, and completely filled with oil in order to obtain the best
simultaneous tripping.
Fig. 2 - Installation with two cylinders
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Rupture valve adjusting

Fig. 3 - Connection VP-pump unit
The rupture valve adjusting operation consists of establishing the valve passage which allows the nominal oil flow to
run freely (nominal speed), but causes a pressure fall inside, able to close automatically that passage, when, because
of an unwanted rise of the downward speed, the oil flow exceeds a given value.
The rupture valve is adjusted in the factory. Since the installation conditions and the oil viscosity can influence the
adjusting value, a test has to be made after the unit installation, according to the operating instructions of chapter 4 -
Working Test.
If the rupture valve adjusting operation has to be made directly on the installation, use the diagram in Table 3.1. There
are three diagrams in this table, which refer to the three sizes of the rupture valve.
Soggetto a modifica senza preavviso! - Subject to change without notice
Pagina/Page D780M3L.006
01.2018
Data/Date
Versione/Issue
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