Cashco BQ Manuel d'utilisateur télécharger pdf

I. DESCRIPTION AND SCOPE

The Model BQ is a back pressure relief regulator used to control upstream (inlet or P

) pressure. Side inlet and ﬂ ow-thru

connections are 1/4", 3/8", and 1/2" NPT (DN8, DN10, DN15); outlet (bottom discharge) connection is always 1/2" NPT (DN15).

With proper trim utilization, the unit is suitable for liquid, gaseous, or steam service. Refer to Technical Bulletin BQ-TB for design

conditions and selection rec om men da tions.

MODEL BQ

BACK PRESSURE / RELIEF REG U LA TOR

II. INSTALLATION

INSTALLATION, OPERATION & MAINTENANCE MANUAL (IOM)

IOM-BQ

12-13

6. Clean the piping of all foreign material including chips,

welding scale, oil, grease and dirt before installing the

regulator. Strainers are recommended.

7. In placing thread sealant on pipe ends prior to en-

gage ment, ensure that excess material is removed

and not allowed to enter the regulator upon startup.

8. Flow Direction: Install so the ﬂ ow direction matches

the arrow cast on the body. Connect the inlet pressure

to the body side connection(s). Fluid will relieve out of

the bottom connection. The double inlet connections

are for in-line installation (plug one side connection if

in-line installation is not required).

9. Regulator may be installed in a vertical or horizontal

pipe. If it is a steam system, ensure the piping is properly

trapped and vented.

CAUTION

This is not a safety device and must not be substituted for a code approved pressure safety relief valve or a rupture disc.

SECTION II

SECTION I

WARNING

The maximum inlet pressure is equal to 1.5 times the larger

number of the stated range spring on the name plate, and is

the recommended “upper operative limit” for the sens ing

di a phragm. Higher pressures could damage the di a phragm.

(Field hy dro stat ic tests fre quent ly destroy di a phragms.

DO NOT HY DRO STAT IC TEST THRU AN IN STALLED UNIT;

ISOLATE FROM TEST.)

CAUTION

Installation of adequate overpressure pro tec tion is rec-

ommended to pro tect the reg u la tor from overpressure

and all down stream equip ment from damage in the event

of regulator failure.

1. An inlet block valve should always be installed.

2. If service application is continuous such that shutdown

is not readily accomplished, it is recommended that

an inlet block valve, outlet block valve, and a manual

bypass valve be installed.

3. Pipe unions should be installed to allow removal from

piping.

4. An inlet pressure gauge should be located ap prox i mate ly

ten pipe diameters upstream and within sight. An outlet

pressure gauge is optional.

5. All installations should include an upstream relief de vice

if the inlet pressure could exceed the pressure rating of

any equipment or the maximum inlet pres sure rating of

the unit.

CAUTION

For welded installations, all internal trim parts, seals and

diaphragm(s) must be removed from reg u la tor body prior to

welding into pipeline. The heat of fusion welding will dam-

age non-metallic parts if not re moved. NOTE: This does

not apply to units equipped with extended pipe nip ples.

Recommended piping schematic for Back Pressure Regulator

1 2 3 4 5 6 7 8

Résumé du contenu

Page 1 - MODEL BQ

I. DESCRIPTION AND SCOPEThe Model BQ is a back pressure relief regulator used to control upstream (inlet or P1) pressure. Side inlet and ﬂ ow-thru c

Page 2 - SECTION IV

IOM-BQ2a. Recommended installation is with the spring cham ber directed upwards.b. No corrosive ﬂ uid should be utilized for spring cham- ber loading

Page 3 - WARNING

IOM-BQ3V. SHUTDOWN1. On systems with a bypass valve, and where system pressure is to be maintained as the regulator is shut down, slowly open the byp

Page 4 - Metal 15 ft-lb (20 N-m)

IOM-BQ415. Insert the diaphragm subassembly into the body (1). Rotate the assembly to ensure that the piston is not binding in the cylinder. If nec e

Page 5 - SECTION VII

IOM-BQ5VII. TROUBLE SHOOTING GUIDE7. Bench test unit for suitable operation. NOTE: Reg u la tors are not tight shutoff devices. Even if pressure fall

Page 6

IOM-BQ6SECTION VIIINEW REPLACEMENT UNIT:Contact your local Cashco, Inc., Sales Rep re sen- ta tive with the Serial Number and Product code. With this

Page 7 - Item No. Description

IOM-BQ7Figure 3: Option -1+6 Differential, Metal Seat Design (includesOption -1 Clos ing Cap)Figure 4:Composition Seat Item No. Description 1 Body

Page 8

Cashco, Inc.P.O. Box 6 Ellsworth, KS 67439-0006PH (785) 472-4461Fax. # (785) 472-3539www.cashco.comemail: [email protected] in U.S.A. IOM-BQCa

Plus de documents pour Capteurs Cashco BQ

Voir le document Cashco BQ Manuel d'utilisateur

Cashco BQ Manuel d'utilisateur (8 pages)

Commentaires sur ces manuels

Pas de commentaire

Cashco BQ Manuel d'utilisateur

Naviguer en ligne ou télécharger Manuel d'utilisateur pour Capteurs Cashco BQ. Cashco BQ User Manual Manuel d'utilisatio

Résumé du contenu

Plus de documents pour Capteurs Cashco BQ

Commentaires sur ces manuels

Produits connexes et manuels pour Capteurs Cashco BQ