ARI Armaturen SAFE-TCP/TCS950 EN - Manual (Page 12)

Page 2-12 Rev. 0040401000 2913
Operating and installation instructions
SAFE, SAFE-P, SAFE-TC, SAFE-TCP/TCS
Closed cap series 960/950
- Remove spring type straight pin (pos. 68)
- Remove lift button (pos. 67) or lifting lever (pos. 36)
- Unscrew cap (pos. 28)
7.1.2 Changing the set pressure “without” spring change
- Check the spring range.
- Spindle (pos. 14) must be held fast by all alterations.
- Loosen lock nut (pos. 21).
- Turn adjusting screw (pos. 17) clockwise to increase and anticlockwise to reduce the set
pressure.
- Secure spring setting by tightening lock nut (pos. 21).
- Assemble lifting device.
7.1.3 Changing the set pressure “with” spring change
- For removing the cap refer to 7.1.1.
- Extract parallel pin (pos. 20) and lift off the spindle cap (pos. 19).
- Slacken locknut (pos. 21) and relieve spring (pos. 37) by turning adjusting screw (pos. 17)
anticlockwise.
- Unscrew nuts (pos. 8) at flange connection.
Fig. 940: loosen coupling (pos. 61)
Fig. 950/960: loosen bonnet (pos. 11)
- Remove bonnet (pos. 11/42).
- Remove top spring-plate (pos. 26) and spring (pos. 37).
- Extract spindle (pos. 14) with disc (pos. 12/12a), guide plate (pos. 4/4a) and bottom
spring-plate (pos. 26).
- Clean seat (pos. 2) and disc (pos. 12).
- Insert spindle (pos. 14) with disc (pos. 12), guide plate (pos. 4), spring-plate (pos. 26) and
different spring (pos. 37).
ATTENTION !
- When changing the set pressure in a pressurised system bear in mind vapour
discharge if bonnet is open, in adjusting screw area if bonnet is closed.
- Note spring setting range.
ATTENTION !
- Depressurise the system before dismantling or opening the safety valve.
ATTENTION !
- With higher set pressures is the bonnet under high spring preload! Therefore
the two nuts (pos. 8) on the longer studs (pos. 3) must be removed last and
simultaneously!