Spirax Sarco Pressure Reducing Valve BRV73

Load screen, taper face downwards with joint of screen facing away from the inlet port

Fit bellows and pushrod assembly with pushrod facing downwards

Fit gasket and bellows assembly (control bellows)

Place control spring on to bellows assembly

Ensure the adjustment knob is backed off properly and the valve is fully isolated

Gradually loosen the 4 x 17 mm A/F hex head screws from the bottom cap and carefully remove the return spring and gasket

Disassembly of Lower Components

Carefully remove the 'O' ring from the lower pushrod

Unscrew the lower pushrod and carefully remove the valve head

Disassembly of Upper Components

Loosen and remove the 4 x 13 mm A/F hex head screws

Remove the spring housing and control spring