ARI Armaturen drainer PN40 EN - Manual (Page 3)

Rev. 0040807000 2404 Page 3
Operating and installation instructions
Liquid drainer
4.0 Description
4.1 Scope of applications
Automatic liquid drainers with thermal control are used to drain off condensate during
system start-up and shut-down.
The information complies to the Pressure Equipment Directive 97/23/EC.
It is the responsibility of the machine planner to ensure compliance.
The special markings on the valve must be taken into account.
Refer to the catalogue sheet to see which materials are used in standard versions.
Please contact the supplier or the manufacturer if you have any questions.
4.2 Operating principles
(refer to Fig. 3 page 6)
The automatic liquid drainer drains condensate from steam facilities during the start-up of a
process. When the set closing pressure is reached the valve shuts automatically.
When the system shuts down or closing pressure is not reached, the valve opens and
automatically takes over residual drainage.
When the system is unpressurised the liquid drainer is held in the open position by the built-
in spring (Pos. 24.5). It shuts as soon as the operating pressure has risen to the set closing
pressure (due to the pressure differential effective at the valve area versus spring
resistance).
If the operating pressure drops below the closing pressure it opens due to spring
resistance.
The liquid drainer is supplied as standard with a factory-set closing pressure of
≥ 1,5 bar.
ATTENTION !
- Refer to the data sheet for applications, limits on use and possibilities.
- Certain media require or preclude the use of special materials.
- The valves are designed for standard operating conditions. If conditions exceed
these requirements, e.g. aggressive or abrasive media, the operator should
state the higher requirements when ordering.
- Valves made from grey cast iron are not authorised for use in systems subject
to TRD 110.