Crane DM921 Installation, Setting And Maintainance Instructions

INSTALLATION, SETTING AND
MAINTAINANCE INSTRUCTIONS
CRANE BALANCING VALVES
DM921 & DMG921 DOUBLE REGULATING VALVE (DRV)
DM931 & DMG931 DA931 & DAG 931 VARIABLE ORIFICE DOUBLE REGULATING VALVE (VODRV)
DM941 & DMG 941 DA941 & DAG941 FIXED ORIFICE DOUBLE REGULATING VALVE (FODRV)
Pressure/Temperature
Rating:
End connections:
Pressure Test Valves:
(931 & 941 ranges only)
Flow direction:
Jointing Gaskets:
Check List:
FITTING PRESSURE
TEST VALVES
The pressure test valve with the red tag should
be fitted to the body tapping nearest to the
inlet end of the valve, and the valve with the
blue tag to the tapping nearest to outlet end of
the valve.
Use a thread sealant and do not exceed 1.1//2
turns from hand tight.
Type 921
16 bar at –10 to 120°C
13.4 bar at 180°C
Flanged valves (DM & DA):Flanges to BS EN1092-2 &
BS4504-3.1 Grooved valves (DMG & DAG): (for suitable pipe
sizes, see installation secton)
Crane P84 insertion test valves. P82 test valves, which
accept 'Mechseal' manometer adapters, are available as an
optional extra for temperatures up to 180°C
An arrow is cast on the side of the valve body to indicate the
direction of flow
Two flange gaskets are required for flanged end valves. IBC
(inside bolt circle) gaskets to BS EN 1514-1 are
recommended
Type 921: Instruction leaflet and Hex. Wrench.
Types 931 & 941: Instruction leaflet, Hex. Wrench & 2
pressure test valves
Type 931:
Remove two of the square headed plugs fitted
to the side tappings of the valve. It is
recommended that the pressure test valves are
fitted to the valve on the side of the flow direction
arrow and I.D. plate. They can be fitted on the
opposite side if access is limited without any
reduction in accuracy.
Type 941:
Remove the square headed plugs fitted to the top
of the valve and replace with the test valves
provided.
Type 931 & 941:
16 bar at –10 to 120°C