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3.1 General description of the valve
VCP Pressure Relief Valves consist of a cylindrical casing with a bottom flange to be connected with a spigot
welded on the silo roof, a disc shape inner steel lid for negative pressure operation held in position by a cen-
tral spring rod, an outside steel ring for excess pressure kept in position by three spring rods, gaskets, and a
weather protection cover.
In the VCP Pressure Relief Valve, helical springs keep the valve lids closed when the pressure value remains
within the preset limits. The three outside spring rods keep the external ring-shaped lid firmly closed as long
as the force generated by the pressure inside the silo does not overcome the spring force. Once the pressure
exceeds the preset value the lid is pushed up and the pressure can escape. The smaller lid covers the central
circular opening of the external lid from below. It is held in the middle by a single spring rod and is pressed
onto the external lid by the normal air pressure inside the silo. In the event of suction pressure, the spring is
compressed and allows the lid to drop. The air entering the silo from outside ensures rapid pressure balance
and pushes the central lid back up into the "closed" position
Important
The terms "equipment" and "valve" used in this manual refer to the same machine.
As components meant for installation in a plant, the valves - not fully provided with safety means -
have to be considered "partly completed machinery". Therefore, they do not bear an EC marking.
It is forbidden to start the valve unless the machine/plant in which it is to be installed has been de-
clared compliant with the Directive 2006/42/EC and further modifications.
3.2 Main components
B
C
A) Negative pressure Lid
B) Adjustment kit (Springs)
C) Equipped for inductive proximity sensors
3.0 TECHNICAL INFORMATION
A
D
VCP
D) Excess pressure lid
E) Weather protection cove
F) Weld-on spigot
10
VAL.VCP.--.M.A5.1017.EN
E
F
10.17
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Issue: A5
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