Flowserve PA46 - Manual (Page 4)

4
Important Notes
Safety Note
The equipment must only be installed and commissioned by qualified and competent staff.
Retrofitting and maintenance work must only be performed by qualified staff
who – through adequate training – have achieved a recognised level of competence.
The valve is under pressure during operation.
When loosening flanged connections, sealing plugs or stuffing boxes, hot water and
steam may escape.
Before carrying out installation and maintenance work make sure the system is
depressurized.
Isolate the valve from both upstream and downstream pressure.
Depressurize control lines!
The valve becomes hot during operation.
This presents the risk of severe burns to hands and arms.
Before carrying out installation and maintenance work make sure that the valve is cold.
Risk of severe burns and scalds to the whole body!
Before carrying out any maintenance work on the valve or loosening flanged
connections, stuffing box unions or sealing plugs make sure that all connected lines
are depressurized (zero bar) and cooled down to room temperature (0 °C).
During operation moving internals can pinch one’s hands or fingers, causing severe
injuries. Do not touch the valve during operation! The intermittent valves for removing
boiler sludge MPA 46, MPA 47 are time controlled and can open and close abruptly.
Sharp edges on internals present a danger of cuts to hands. Always wear industrial
gloves when replacing the packing, valve seat or valve plug!
Danger
Usage for the intended purpose
PA 46, PA 47, MPA 46, MPA 47:
Use the rapid-action intermittent valves*) only for removing boiler water containing accumulated
nonmetallic sediments from steam boilers within the admissible pressure und temperature ratings.
Use only compressed air (at room temperature) or pressurized water (at room temperature) as control
fluid for the GESTRA diaphragm actuator in accordance with the specified pressure/temperature
ratings.
Application in potentially explosive atmospheres as classified according to Annex I of ATEX Directive
94/9/EC.
*) Please note:
In British English an intermittent valve for removing boiler sludge is referred to as “ (intermittent)
bottom blowdown valve”.
In American English the term “
(intermittently operating) blowoff valve” is used, but only in
conjunction with a slowopening valve (ASME code).