Armstrong TVS 4000 Manuel d'installation et d'utilisation - Page 2
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General Safety Information
This bulletin should be used by experienced personnel as a guide to the installation and maintenance of the TVS 4000/F
Trap Valve Station Series. Selection or installation of equipment should always be accompanied by competent technical
assistance. We encourage you to contact Armstrong or its local representative if further information is required.
Operation
In a piston valve, the control of stem and seat leakage is obtained by tightness of valve sealing rings to the body and valve
plug. The bonnet compresses the valve sealing rings against the body and the valve plug.
Flexible disc springs automatically assure a tight seal by exerting pressure on the valve sealing rings, keeping them
compressed.
Opening and Closing the TVS Isolation Valve
The isolation valve begins to stop flow when the valve plug enters the lower valve sealing ring.
When the isolation valve is completely closed, the valve plug is in full contact with the valve sealing rings, ensuring the
best possible seal. Since there is no metal to metal seating, torquing the isolation valve closed is not required. Armstrong
recommends that after closing the isolation valve completely, the handwheel should be turned back one half turn. This
makes it easy to re-open the valve after prolonged periods of no use.
Testing TVS 4000/F Trap for Operation
Open test valve – Condensate may discharge from the test port on the bottom of the connector.
Note: Test valve is on the inlet side of the casting marked "Test".
Caution: Hot condensate and flash steam will be discharged from the test port. Use caution as burns could occur to
personnel.
Close TVS outlet isolation valve.
Observe trap operation at test port.
To place trap back in operation open TVS outlet isolation valve and close test valve.
Close test valve with 40-50 ft. lbs. torque.
Testing TVS 4000/F Trap for Operation
Close TVS 4000/F inlet and outlet isolation valves.
Open TVS 4000/F strainer blowdown valve to relieve pressure inside trap.
Caution: Hot condensate and flash steam will be discharged from the trap at the strainer blowdown valve discharge
port. Use caution as burns could occur to personnel.
After pressure has been relieved, remove bolts and the trap.
Clean trap connector sealing surfaces.
Apply "never seize" to the new trap bolts, insert bolts through connector block making sure, if the trap is an
inverted bucket type it is in the vertical position. Tighten bolts evenly.
Close TVS 4000/F strainer blowdown valve.
Open TVS 4000/F inlet and outlet isolation valves.
Check for leaks around trap connector.
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