Typical Installation; Nitrogen System - DANIEL 762 User Manual

CONTROL VALVES 762, 763, 765, 766 AND 767
Installation prerequisites
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.
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.
68
72
www.Daniel.com
Typical installation - 766 Gas loaded pressure relief valve
Daniel Models 762, 763, 765, 766 and 767 Control Valves