_____________________________________________________________________________________
STI S.r.l.
– Via Dei Caravaggi 15, 24040 Levate (BG) – ITALY www.imi-critical.com
Manual 5400, rev. 05 02/2018
– RTQHS
16
7.2.1.2 Setting of the stopper on the spring side (Fig. 6)
Start this operation with valve in open or intermediate position.
Loosen the nut (6.3) from the setting screw (6.2) and unscrew the setting screw (6.2) until it remain only a
few threads engaged on the end flange of the spring cartridge.
By releasing the air in the cylinder or by using the manual override, move the valve until it reach the correct
setting in closed position. Fix then the valve position by screwing the setting screw (6.2) until it stops on the
end part of the internal spring stem.
Taking care not to damage it, reinstall the sealing washer (6.4) and screw until it fit into the groove of the
spring cartridge bushing (6.1), then block all the system with the nut (6.3).
To avoid the risk of unsetting the setting screw (6.2) during this last operation, keep the setting screw (6.2)
blocked by using an Allen wrench engaged on the on the hexagonal receptacle.
Fig. 5
– Stroke adjustment detail
Fig. 6
– Stroke adjustment detail
7.2.2 Spring to Open version
7.2.2.1
Setting of the stopper on the cylinder side (Fig. 7)
Start this operation with the air in the hydraulic cylinder exhausted and valve in open or intermediate
position.
Loosen the nut (7.3) from the setting screw (7.2) and unscrew the setting screw (7.2) until it remain only a
few threads engaged on the end flange of the cylinder.
By pressurizing the cylinder, move the valve until it reach the correct setting in closed position; fix then the
valve position by screwing the setting screw (7.2) until it stops on the end part of the internal piston.
Taking care not to damage it, reinstall the sealing washer (7.4) and screw until it blocks against the surface
of the end flange; put then in place the protection washer (7.1) around the sealing washer (7.4) and block all
the system with the nut (7.3).
To avoid the risk of unsetting the setting screw (7.2) during this last operation, keep the setting screw (7.2)
blocked by using an Allen wrench engaged on the on the hexagonal receptacle.
7.2.2.2 Setting of the stopper on the spring side (Fig. 8)
Start this operation with valve in closed or intermediate position.
Summary of Contents for STI RTQH Series
Page 41: ......
