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
Pa
g.
11
/24
6
MAINTENANCE
All operations described below must be performed and supervised by skilled, trained and
competent personnel.
The Mec-Rela valves are uniquely identified by a serial number fixed on the plate located
on the actuator’s yoke. To order any spare parts or for any other need, always refer to the
above-mentioned number.
I
NFORMATION
!
During operation the valve is pressurized. Before performing any maintenance operation or
action on any pressure retaining part, make sure that the line is depressurized (0 bar) and at
ambient temperature.
6.1
R
EPLACEMENT
O
F
A
CTUATOR
D
IAPHRAGM
Separate the actuator from the valve (see section 6.3). In reference to the Fig.
and Fig.
for reverse action actuators and the Fig.
and Fig.
for direct action actuators, proceed
as follow:
Remove carefully the screws (1) slowly in a crisscross way.
Remove the housing lid (2) by loosing the plate locknut (3) and removing the clamp
(5) then replace the diaphragm (4).
Refit all the items in reverse order.
W
ARNING
!
In order to avoid serious damages, when the valve is provided of bellows, take care not to
turn the plug stem (6).