5.6
Typical installation
Although quick opening of the surge relief valve is desirable, if the valve were to shut in a
similar time, then further problems could occur - a valve slamming shut can produce
hydraulic shock (water hammer) in the system, creating an undesirable secondary surge.
Good surge relief system design will include systems to dampen, or slow the valve, on
closing. Often, this requires sophisticated reverse flow when opening and reduced orifice
to limit closing speed. This design is extremely versatile and offers the user the opportunity
to determine different closing speeds as required by the system when the valve is built.
Typical installation - 766 Gas loaded pressure relief valve
Figure 5-1:
NOTICE
The Daniel Models do not comply with any internationally over-pressurization protection
recognized codes. What the Daniel Models do is to allow the movement of an undetermined
amount of substance
within
a pressurized system, not
from
a pressurized system.
5.7
Nitrogen system
The nitrogen system must supply a constant pressure to the valve, even under conditions
of varying ambient temperatures. Normally, the system will be designed to use standard
gas bottles and will incorporate a control panel to regulate the nitrogen supply pressure.
Installation prerequisites
68
Daniel Models 762, 763, 765, 766 and 767 Control Valves
Summary of Contents for Daniel 762
Page 8: ......
Page 12: ...Plan 2 Daniel Models 762 763 765 766 and 767 Control Valves ...
Page 47: ...Models 762 763 765 766 and 767 Control Valves NPS 16 Figure 1 6 Introduction User manual 37 ...
Page 52: ...Introduction 42 Daniel Models 762 763 765 766 and 767 Control Valves ...
Page 72: ...Prepare the control valve for use 62 Daniel Models 762 763 765 766 and 767 Control Valves ...
Page 74: ...Install 64 Daniel Models 762 763 765 766 and 767 Control Valves ...
Page 82: ...Installation prerequisites 72 Daniel Models 762 763 765 766 and 767 Control Valves ...
Page 88: ...Testing the product 78 Daniel Models 762 763 765 766 and 767 Control Valves ...
Page 89: ...Part III Operate Operate User manual 79 ...
Page 90: ...Operate 80 Daniel Models 762 763 765 766 and 767 Control Valves ...
Page 96: ...Maintain 86 Daniel Models 762 763 765 766 and 767 Control Valves ...
Page 112: ...Decommission 102 Daniel Models 762 763 765 766 and 767 Control Valves ...
Page 113: ...Decommission User manual 103 ...
Page 114: ...Decommission 104 Daniel Models 762 763 765 766 and 767 Control Valves ...
Page 115: ...Decommission User manual 105 ...