Operators
manual
Gorter-Controls B.V. – Schoonhoven- The Netherlands
Operators manual underground gas pressure reducing station
Type: COCON 26 N-LP
Page 7
The gas pressure reducing station COCON 26 consists of two parts:
-
the casing (01);
-
the gas pressure reducing and safety unit.
Remark:
The "gas pressure reducing and safety unit" will be referred to as the cartridge in the rest of
the manual.
A ball valve (02) is attached to the inlet of the casing. As the ball-valve is open, the ball-valves handle
prevents to open the casing cover. The hinged pit cover (04), with lock, closes over the casing cover.
A dust filter (05) is attached under the cartridge.
The gas pressure reduction is achieved with a regulator (06) (sleeve type).
The gas will pass through two safety devices in the cartridge:
-
The monitor control (07) is the first device. If the regulator should fail open, due to a malfunction,
then the monitor control will take over the function of the regulator.
-
The second device consists of the safety shut-off valve (08) and the shut-off relay (09). The shut-off
relay, with an emergency knob, is attached to the top of the cartridge. If the monitor control opens
excessively, then the shut-off relay will detect an increase of pressure and move the steering rod
upward. The safety shut-off valve will cut off the gas supply by spring pressure.
The regulator and the monitor control are pilot controlled. The required outlet pressure is set with the pilots.
A butterfly valve (10) is attached to the outlet flange. The valve can be operated without removing the cover
of the casing. While the valve is open, it is not possible to open the casing cover.
The installation of a relief valve is possible.
Pressure transmitters for distance measurements of pressure, are also available. The station is fitted with
three pressure gauges.The gauges are for the inlet pressure, intermediate pressure (between regulator and
monitor control) and outlet pressure. The gauges are situated under the pit cover and are visible when the pit
cover is opened. The gauges are protected by the plexiglass casing cover.
The pressure compartments can be fitted with vent pipes and valves.These valves are than situated directly
under the pit cover and block the casing cover, when the station is in operation.
Two handles are attached to the cartridge, so that the gas pressure reducing and safety unit can be easily
removed from the casing.
