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Device Sizing

 Valve Dimension Essay

Bulletin 1-I

C v1, Farrenheit L1

Fpv

(p в€’F )

Cv1= Cv a couple of

1

Fpv

(p в€’ F )

L you

2

L2

∆pm ax (1) = F

p1

∆pmax (2) =F

two

1

C v two, F M 2

FL1 > FL 2

photo voltaic

pvc

p2I

p2II

p2III

p2IV

GUIDE

FOR CONTROL

VALVE DIMENSION

* PARCOL

HANDBOOK

PERTAINING TO CONTROL

CONTROL DEVICE SIZING

ITEMS

NOMENCLATURE

DEVICE SIZING AND SELECTION

you

PROCESS INFO

2

VALVE SPECIFICATION

several

FLOW AGENT

3. you KV agent

3. 2 Cv pourcentage

3. a few Standard test conditions

4

SIZING EQUATIONS

4. 1 Sizing equations for incompressible fluids (turbulent flow) four. 2 Dimensions equations intended for compressible liquids

(turbulent flow)

4. a few Sizing equations for two-phase fluids

some. 4 Sizing equations intended for non violent flow

5

PARAMETERS OF SIZING EQUATIONS

5. you Recovery element FL

your five. 2 Coefficient of incipient cavitation xFZ and

agent of regular cavitation Kc

5. several Piping geometry factor Fp

5. 4 Combined the liquid pressure restoration factor and piping angles factor of a control device with fastened fittings FLP 5. 5 Liquid essential pressure rate factor FF

5. six Expansion aspect Y

a few. 7 Pressure differential proportion factor xT

5. eight Pressure differential ratio factor for a

control device with fastened fittings xTP

5. on the lookout for Reynolds amount factor FR

-1-

2. PARCOL

Emblems

Description

Devices (note)

Compact disk

Specific circulation coefficient sama dengan Cv/ d2

various

Cv

Flow pourcentage

U. S. gallons/min

m

Nominal control device size

mm

D

Inner diameter of piping

logistik

Fd

Control device style changer

dimensionless

FF

Liquid crucial pressure ratio factor

dimensionless

FL

dimensionless

FP

Water pressure restoration factor for any control valve without attached fittings

Merged liquid pressure recovery factor and piping geometry factor of a control valve with attached fixtures

Piping angles factor

dimensionless

FR

Reynolds number aspect

dimensionless

FОі

Specific high temperature ratio element = Оі/1. 4

dimensionless

KB1 and KB2

dimensionless

Kc

Bernoulli coefficients pertaining to inlet and outlet of the valve with attached reducers

Coefficient of constant cavitation

dimensionless

Kaviar

Flow agent

m 3/h

K1 and K2

Upstream and downstream resistance coefficients

dimensionless

Meters

Molecular mass of the going fluid

kg/kmole

pc

Complete thermodynamic crucial pressure

pub

pv

Total vapour pressure of the water at outlet temperature

pub

pvc

Estrato contracta absolute pressure

bar

p1

Outlet absolute pressure measured for upstream pressure tap

club

p2

Store absolute pressure measured by downstream pressure tap

bar

∆p

Pressure differential among upstream and downstream pressures

bar

∆p max

bar

qm

Optimum allowable pressure differential intended for control control device sizing functions for incompressible fluids

Mass flow price

kg/h

qv

Volumetric movement rate

m 3/h

qm(max)

Maximum mass flow price in clogged condition

kg/h

qv(max)

Optimum volumetric stream rate in choked state

m 3/h

Rev

Valve Reynolds number

dimensionless

T1

Inlet complete temperature

E

u

Normal fluid velocity

m/s

FLP

dimensionless

Note - Unless otherwise specified

-2-

* PARCOL

Signs

Description

Devices

v

Specific volume

m 3/kg

by

Ratio of pressure differential box to outlet absolute pressure

dimensionless

xcr

Ratio of pressure differential to outlet absolute pressure in crucial conditions (∆ p/p1)cr

dimensionless

xFZ

Coefficient of incipient cavitation

dimensionless

xT

dimensionless

xTP

Pressure differential percentage factor in clogged flow state for a valve without attached fittings

Worth of times T for valve/fitting set up

Y

Development factor

dimensionless

Z

Compressibility factor -- ratio of ideal to actual outlet specific mass

dimensionless

Оі

Specific temperature ratio

dimensionless

ПЃОї

Specific mass of water...

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