4.8.9

Control valves

Desuperheaters

Safety information, installation and maintenance

For full details see the Installation and Maintenance Instruction that are supplied with the product.

Installation note

Desuperheaters may be installed either horizontally or vertically with the steam flowing upwards.

Spirax Sarco strongly advises against installations in which the steam flow is vertically downwards.

In the case of a horizontal installation the cooling water connection (and the atomising steam connection on a steam atomising

desuperheater) should ideally point downwards, as this gives the best orientation for drainage of fluids in a shutdown situation. Other

orientations are acceptable for satisfactory operation, but drainage is not as effective.

In a vertical installation we recommend that, the cooling water pipework (and atomising steam pipework, if applicable) should be brought

to the Desuperheater from below the corresponding connections on the desuperheater. This will provide the best layout for drainage

of fluids on shutdown.

Desuperheating and pressure reducing stations

Spirax Sarco can provide complete desuperheating and pressure reducing stations including control valves, temperature sensors,

pressure transmitters, instrumentation and pipework, all mounted on a support skid.

Pressure

controller

Desuperheater

Steam supply

Cooling water

Page 8 of 9

TI-P475-01 CH Issue 3

Pressure regulating control valve

Temperature regulating control valve

TS PT

Temperature

controller

Combined desuperheating and pressure reducing station for venturi and spray type desuperheaters

Direct Contact Desuperheaters