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Saunders P345 Pneumatic Actuator
Installation, Operation & Maintenance
6. Elastomer Single piece Diaphragm
Engage diaphragm threaded stud into the compressor by
applying pressure to the centre of the diaphragm. Ensure
correct engagement and continue to rotate clockwise
until resistance felt. Rotate diaphragm anti-clockwise until
diaphragm bonnet hole alignment is achieved
7. PTFE Faced Two Piece Diaphragm
Engage diaphragm bayonet into the compressor slot by
applying pressure to the centre of the diaphragm. Ensure
correct engagement and continue to apply pressure to the
centre of the diaphragm and turn through 90°
8. Ensure actuator is full open
Apply air pressure to ‘NC’ actuators.
Attach the actuator to valve body;
Insert the retaining fasteners.
Hand tighten fasteners in the order
shown in Figure 1.
Use diagonally opposing technique to tighten fastenings at
all times.
9. Ensure actuator is in the closed
position:
• Release air pressure on
‘NC’ actuators
10. Gradually tighten the fasteners as per gure 1 to
approximately 3/4 of full torque. (See torque specication
table). This ensures that the diaphragm seats correctly
before further tightening
11. Ensure Actuator is fully open:
• Apply air pressure to ‘NC’actuators
