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SPRING LOADED BACK PRESSURE VALVE
5
Installation procedure
5.1
External components assembly
Install the external components (e.g., flanges) onto the pipeline.
The control valve is assembled at the factory. The components do not need to be
uninstalled or reinstalled unless maintenance is required.
CAUTION
SURFACE TEMPERATURE HAZARD
The control valve body and piping may be extremely hot or cold.
Wear personal protective equipment appropriate to the situation when working with
the control valve. Adhere to your company's safety standards and practices.
Failure to comply may cause serious injury.
5.1.1
Fasteners
The property class of the fastener is in accordance with ASME B16.5.
Stud bolt and nut types
All fasteners (nuts and studs) used in assembling Daniel control valves are made of one of
the materials listed in the table below.
Table 5-1: Bolt material selection
Bolt material selection
Description
ASTM SA 193 Grade B7 <63.5 mm (<2.5 in.)
High strength low alloy steel
ASTM SA 193 Grade B7M <63.5 mm (<2.5 in.)
Controlled strength low alloy steel
ASTM SA 320 Grade L7 <63.5 mm (<2.5 in.)
High strength low alloy low temperature steel
ASTM SA 320 Grade L7M <63.5 mm (<2.5 in.)
Controlled hardness low temperature steel
ASTM SA 449 <25.4 mm (<1.0 in.)
Quenched and tempered steel
ASTM SA 453 Grade 660
High temperature stainless steel
Selection of stud bolts and nuts
•
Select all fasteners (nuts and studs) used in a hydrostatic test according to the flange
size and class listed in ASME B16.5.
•
Use the shortest stud bolt that permits full engagement of the thread through the nut
by hand-tightening.
•
Use only clean, rust-free nuts and stud bolts.
Note
Ensure that once the nut is tightened two threads outside the nut are exposed. The only
exception is when a flange requires hydraulic bolt tensioning. The manufacturer of the
User manual
Installation procedure
DAN-20064957
August 2019
User manual
39
