Spirax Sarco Valve BSA2T PN25 DN150-DN200

Observe the data in Section 1 - 'Safety information' before starting maintenance

Warning: Handle and dispose of body/bonnet collar gaskets (10a and 10b) carefully

Unscrew the main handwheel nut in a clockwise direction

Place a suitable spanner across the flats of the bonnet bush (2) and unscrew the handwheel

Apply Loctite 638 to the threads of the handwheel boss

Tighten the handwheel boss to 50 N m (36 lbf ft)

Review Section 1 - 'Safety information' before starting maintenance

Handle and dispose of body/bonnet collar gaskets (10a and 10b) carefully to avoid injury

Remove the old stem pin and replace the disc (4)

Attach the new disc with the new stem pin (supplied)

If applicable, prise the crimped skirt away from the retaining nut and unscrew

Remove and save the collets and retaining nut for reuse

Lightly grease collets and threads with lubricating compound such as Molybdenum Sulphide

Review Section 1 - 'Safety information' before starting any maintenance program

Handle and dispose of body/bonnet collar gaskets (10a and 10b) carefully

Remove all old stem packing material from the bonnet cavity

Check that only one stem packing ring is used from the spares kit

Align the solid stem pin with the slot inside the bonnet

Fit a bellows collar gasket between the collar and the valve bonnet

Review Section 1 - 'Safety information'

Handle and dispose of body/bonnet collar gaskets (10a and 10b) carefully

Stem/Bellows Assembly Installation

Fit a new stem/bellows assembly (6, 5)

Fit a bellows collar gasket (10a) between the bellows support collar and valve bonnet (2)

Ensure the bellows collar gasket (10a) is accurately located

Apply lubricating compound to the end of the stem pin

Align the stem pin with the slot inside the bonnet

Observe the data in Section 1 - 'Safety information'

Warning: Handle and dispose of body/bonnet collar gaskets (10a and 10b) carefully

Ensure the valve is connected in the pipeline

Remove the valve bonnet (2) from the body (1) by unscrewing bonnet studs/nuts (9)

Check if the body gasket (10b) is visible