ARI Armaturen CONA SC-Plus PN40 EN - Manual (Page 3)

Rev. 0040805003 3409 Page 3
Operating and installation instructions
CONA
®
SC/SC-Plus - Ball float steam traps
4.0 Description
4.1 Scope of applications
Series 634/635: Float-type steam traps with level- and thermal control are used for the
drainage of steam facilities.
Series 636: Float-type steam traps with level control are used for the drainage of systems
with compressed air or aqueous gases.
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. 7 page 10)
The steam trap is controlled by a swivel-mounted ball float (pos. 24.16).
If condensate is flowing towards the steam trap, the ball float (pos. 24.16) rises and opens
the discharge valve using the lever mechanism.
At series 634/635 (version with diaphragm capsule):
An intercoupled diaphragm capsule (pos. 24.17) ensures automatic start-up air venting
when cold.
If the amount of condensate decreases or if there is no condensate, the float ball
(pos. 24.16) falls and shuts the discharge valve.
The compact float ball (pos. 24.16) exerts level-dependent control on the valve ball
(pos. 24.4) by means of a lever mechanism. As the level of condensate rises, the valve ball
(pos. 24.4) is rolled off the valve bore by the lever mechanism, thus opening the valve. The
condensate can now drain away.
If the amount of inflowing condensate is less than the possible valve output or if there is no
condensate flow, the ball float (pos. 24.16) falls and the valve ball (pos. 24.4) rolls back
onto the valve bore. The valve is now closed.
If the steam trap is only acted upon by gas, the float ball (pos. 24.16) remains in equilibrium,
the valve stays shut.
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.