Flowserve 800 Globe Valve - Manual (Page 4)

800 Globe Valves FCD ADENIM0008-00
4
1.0 Physical Description And Operation Of Equipment
1.1 Globe Valves
These valves are primarily designed for tight-shutoff and throttling service where control of the velocity of the fluid is
necessary. If required, they can also serve as a means of isolating a portion of a system. Their use however, is limited
to those systems where head losses are not critical as the internal flow passage creates a pressure drop across the
valve. With the disc in the full open or any intermediate position, the fluid is allowed to flow through seat area at a rate
determined by the position of the disc. With the disc in the closed position, the force of the stem provides a mechanical
seal between the disc and seat and effects a shutoff at the valve.
The Series 800 globe valve is a precision cast body and yoke assembly. It is an investment casting and offers smooth
flow passages for minimum pressure drop and minimum turbulence.
Series 800 globe valves are provided with a quick-open style disc to provide throttling flow characteristics.
Series 800 globe valves are supplied with handwheel actuators. To operate these manual valves, turn the handwheel in
a clockwise direction for closure and counter clockwise for opening.
2.0 Design Conditions
Refer to the applicable drawings in Section 11 of this manual.
3.0 Operating Conditions
Refer to the applicable drawings in Section 11 of this manual.
4.0 Test Conditions
4.1 Each valve covered by this manual has received the following hydrostatic tests:
4.1.1 Shell hydrostatic test at 1.5 times the 100
°
F pressure rating.
4.1.2 A disc closure test at 110% of the 100
°
F pressure rating.