OPERATIVE MANUAL
MN-L20-A1
DC-18-10
MEC-RELA®
- www.mecrela.it – mecrela@terranova-instruments.com
a TERRANOVA® Srl brand
- www.terranova-instruments.com - VAT IT07848810151
Factory & Sales: Via Gramsci 1 – 26827 Terranova dei Passerini (LO) – Italy
Head Office: Via Rosso Medardo 16 – 20159 Milano – Italy Ph: +39 0377 919119 – Fax: +39 0377
855720
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4
INSTALLATION
The valve body casting is marked with an arrow showing the direction of flow and its
normal flow path. The casting also has markings which show the type of material and
maximum operating pressure. Before installing the valve, make sure that the inside of the
is clean, by performing, if required, an energetic blowing with steam or compressed air.
This should be done with caution.
The installation of a filter (pos. A Fig. 1) upstream the valve will prevent dirt entering the
valve.
To allow periodical maintenance of valves that are installed on continuously operating
systems, it is recommended to install two Isolating valves, located upstream (pos. B Fig. 1)
and downstream (pos. C Fig. 1) of the control valve, and a by-pass one (pos. D Fig. 1). Use
the by-pass valve (pos. D Fig. 1) to manually regulate the process when the control valve is
temporarily disconnected.
The two shut-off valves must have the same internal diameter of the control valve. During
the installation of the valve, make sure that the flow in the pipe goes in the same direction
as indicated by the arrow on the valve body.
Fig. 1 - Installation diagram
The assembling position of the valve does not limit its operation, but it is recommended to
assemble the valve with the actuator pointed upward (pos. E Fig. 1) as other positions may
allow the accumulation of any impurities which are contained in the fluid thus damaging
the valve itself.
