Valves
Valve types & applications
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shows different valves and applications
Typology: Lecture notes
2017/2018
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Valves
Valve types & applications
Valve type by function
STOP VALVES– Closed or (wide) open to isolate
equipment or system, or route flow.
THROTTLE VALVES– may be partially opened to
control (throttle) flow.
CHECK VALVES– Permit flow in one direction only:
open when upstream pressure is greater than down-
stream, closed when downstream pressure is higher
STOP-CHECK VALVES– Act as stop valve when
closed, check valve when fully opened; may be
throttled to control flow (in one direction)
Valve type by function
STOP VALVES–
THROTTLE VALVES–
CHECK VALVES–
STOP-CHECK VALVES–
REGULATING VALVES–
RELIEF VALVES– (Automatically) open at a
predetermined level above the normal operating
pressure to protect system.
SAFETY VALVES– similar to relief valves, but reset
at a pressure below their “popping” level
GATE VALVES
Stop valve
function only
(closed or wide
open)
SEAT
DISC
BONNET
BODY
PACKING GLAND
STEM
HANDWHEEL
YOKE
BALL VALVES
Stop valve
function only
(closed or wide
open)
Suitable for high
pressure liquid
systems (S.W.
valves on
submarines)
BODY
PACKING GLAND
STEM
HANDLE
BALL VALVES
Open/close with only 90
o
rotation of handle
Valve open with handle in line with piping
Negligible opposition to flow when fully open
BUTTERFLY VALVES
GLOBE VALVES
Stop valve
or throttling
function
SEAT
DISC
BONNET
BODY
PACKING GLAND
STEM
HANDWHEEL
GLOBE VALVES
Numerous
construction
forms
CHECK VALVES
Swing Check
May be mounted
horizontally or vertically
Lift Check
Horizontal mounting only
VALVE SYSTEM NOMENCLATURE
Isolating Valves–
Pumps: Suction & Discharge
Heat Exchangers, metering &
control devices: inlet & outlet
Root Valves
F.O. HTR
M
suction discharge (^) inlet
inlet
outlet
outlet
root V.
burner V.
P
VALVE SYSTEM NOMENCLATURE
Control Valves–
Constant Pressure Regulator
F.O. HTR
M
suction discharge (^) inlet
inlet
outlet
outlet
outlet inlet
P
P
VALVE SYSTEM NOMENCLATURE
Control Valves–
Constant Pressure Regulator
F.O. Press Regulating Valve
F.O. HTR
M
suction discharge (^) inlet
inlet
outlet
outlet
outlet inlet
outlet inlet
Comb Contr (air) signal
REGULATING VALVES
Air-Regulated
Downward
Seating
Upward
Seating
direct acting
indirect acting