DVC 3500 Instalação, operação e manutenção - Página 3

Procurar online ou descarregar pdf Instalação, operação e manutenção para Unidade de controlo DVC 3500. DVC 3500 4 páginas.

TYPE 3500 INSTALLATION, OPERATION & MAINTENANCE MANUAL

6. USE OF THE ANGLE SEAT VALVE

Make sure the air is clean and dry.

Check the regulator for correct air pressure and correction (3-8 Bar).

Check the environmental temperature (-10°C to 80°C)

Check the fluid temperature (PTFE:-20°C to 180°C)

Verify on/off positions in the valve.

7. WELD END VALVES

While welding the valves with the pipeline, ensure absolute cleanliness as dirt can

enter the body and damage the sealing of the stem guide and seats.

Dismantle the top of the valve before welding.

10. OPERATION

Before putting new valve into service, check the size, ends, material and pressure

temperature limitation of the valve with the operating parameters for capacity and

compatibility.

11. MAINTENANCE

Parts of the valves are generally maintenance free. The materials of the sliding parts

have been selected to keep wear to a minimum. However, for reasons of safety and to

reduce maintenance and repair costs, all valves, especially those which are operated

occasionally shuld be inspected at least two times a year.

12. DISMANTLING

If the valves do not seal tight, it indicates that the seat is damaged and the valve

must be dismantled.

Before removing the complete valve from the pipeline or prior to repair of the valve in

the pipeline itself, the entire valve must be depressurized and sufficiently cooled down

so that the temperature is below the evaporation temperature of the flow medium

(in stuffing box too) and scalding prevented.

The seating surfaces and gasket should then be examined. If damaged please change

the valve or seat.