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Valves for begginers, Lecture notes of Engineering

shows different valves and applications

Typology: Lecture notes

2017/2018

Uploaded on 03/15/2018

ryancarden
ryancarden 🇺🇸

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Valves
Valve types & applications
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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