10633 W Airport Blvd. STE 200
Chaoda Group USA Co., LTD
Tel: +1 (832) 939-9944
Stafford, TX 77477
Fax: +1 (832) 939-9942
Pa
ge
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Chaoda Group USA Co., LTD
3.
Open the secondary safety needle vent/bleed valve located at the front of the closure
door. This will vent any excess pressure, releasing the mechanical stop, and unlocking
the closure door(entry cap).
For 4’’ pigging valve. Turn the handle to fully open the safety needle bleeder on
the closure. Then, remove the locking bolt and closure. Only after these safety
devices have been removed (to make sure the cavity vented), the closure can be
opened by turning the handle.
For 6’’ and above pigging valve. Turn the handwheel to fully open the safety
needle bleeder on the closure. Only after these safety devices fully opened (to
make sure the cavity vented), the closure can be opened by turning the handle.
Note: It won’t let you turn the handle to open the closure if the safety needle valve
is not fully opened
4.
Open the closure and remove the pig.
5.
Reinstall the closure -- align and adjust the closure with the entry bore, close it and
turn the handle to lock it. Then, fully close the secondary safety needle valve at the
front of the closure and the vent/drain fittings/valves on the body.
Note: Ensure the safety needle valve is fully closed before going to the next step.
6.
Open the pig valve by using the gear operator to resume line flow/receive the next
pig.
