CF
S_
DR
V_
11
09
IO
M
0A
03
77
5B
DOUBLE REGULATING AND
COMMISSIONING VALVES
D921/923 - D931/933/934 - DP931/933/934
Crane Double Regulation Valve (DRV) & Fixed Orifice Double Regulation Valve (FODRV);
• are Y-pattern globe valves having characterised disks tending towards equal
percentage performance
• the double regulating feature allows valve opening to be set with an 3mm Allen key
• operation of the valve is by means of the Microset hand wheel
• the D921/D923 DRV and D931/D933/D934 FODRV valves are WRAS approved
• the DP931/DP933/DP934FODRV are designed as ʻCompanion Valvesʼ for the
Differential Pressure Control Valve
LIMITS OF USE
These installation, operation and maintenance instructions have been categorised in
accordance with the Pressure Equipment Directive – PED.
The fluid to be transported is limited to Group 2 liquids i.e. non-hazardous.
On no account must these valves be used on any Group 1 liquids, Group 1 gases
or Group 2 gases.
INSTALLATION AND OPERATING INSTRUCTIONS
COMMISSIONING
In the D931/D933/D934 and DP931/DP933/DP934 ranges, the flow rate is established by
measuring the differential pressure using the P84 test points - red is high pressure and blue
is low pressure. All valves are fitted with our ʻMicrosetʼ handwheel, which indicates the
valve set position, open to shut is 4 complete turns. The outer ring indicates 1/10th of turns
and the inner window indicates complete turns open, ie. a reading of 3 in the inner window
and 1 on the outer ring indicates 3.1 open; 4 being fully open.
Set flow rate as follows;
• connect measuring device to test points following the connection procedure specified by
the manufacturer of the device
• either by calculation or use of graphs, equate differential pressure to flow rate.
Graphs are available on our website or from our technical department
• flow regulation is achieved by adjusting the handwheel position
• once design flow rate is achieved, note handwheel position. The handwheel contains a
setting facility which should be used to maintain the set position, this can be set
as follows;
- remove cap in centre of handwheel
- using a 3mm Allen key tighten the centre screw until it stops, care should be taken
not to over tighten
- replace centre cap
- the valve can now be closed to isolate but will only open to the set position
www.cranefs.com
• Designed and manufactured under quality management
systems in accordance with BS EN ISO 9001-2008
The Company reserve the right to amend any product without notice.
FM311
ISO 9001
www.cranebsu.com
CRANE HOUSE, EPSILON TERRACE
WEST ROAD, IPSWICH
SUFFOLK IP3 9FJ
TELEPHONE: +44 (0)1473 277300
FAX: +44 (0)1473 277301
EMAIL: [email protected]
