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MODELS CA-1 AND CA-2

BACK PRESSURE / RELIEF REGULATORS

SECTION I

DESCRIPTION AND SCOPE

SECTION II

Recommended Piping Schematic For Back Pressure/Relief Station

Models CA-1 and CA-2 are back pressure/relief regulators used to control upstream (inlet or P

) pressure. Sizes for

CA-1 – 1/8" and 1/4" (DN6 and DN8); for CA-2 – 3/8" and 1/2" (DN10 and DN15). Both models are bronze bodied

units. With proper trim utili za tion, both units are suitable for liquid and gaseous service. Refer to Tech ni cal Bul le tin

CA-TB for speciﬁ c design conditions and selection rec om men da tions.

II. INSTALLATION

INSTALLATION, OPERATION & MAINTENANCE MANUAL

IOM-CA

12-13

This is not a safety device and must not be sub sti tut ed for a code approved pressure

safety relief valve or rupture disc.

1. An inlet block valve should always be in stalled.

2. If service application is continuous such that

shut down is not readily accomplished, it is rec-

ommended 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 -

proxi mately ten pipe diameters upstream, and

within sight. An outlet pressure gauge is op -

tion al.

5. All installations should include an upstream

safe ty relief de vice if the inlet pressure could

ex ceed the pres sure rating of any equip ment or

the max i mum inlet pres sure rating of the unit.

WARNING 1

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 rec om mend ed "upper op er a tive limit" for the

sens ing diaphragm. Higher press ures could dam age the

di a phragm. (Field hydro static tests fre quent ly destroy

dia phragms. DO NOT HYDRO STATIC TEST THRU AN

IN STALLED UNIT; ISO LATE FROM TEST.)

The instructions in this manual will refer to both models, unless otherwise stated.

CAUTION A

6. Clean piping of all foreign material including chips,

welding scale, oil, grease and dirt before installing

the regulator. Strainers are rec om mend ed.

7. In placing thread sealant on pipe ends prior to

en gage ment, ensure that excess material is re-

moved and not allowed to enter regulator upon

startup.

8. Flow Direction: Install so the flow di rec tion

aligns with the word “IN” stamped on the body.

Con nect the inlet pres sure to the body (1) side

Models CA-1/CA-2

BP/Relief Regulator

Flow-Thru Design

Summary of content (8 pages)

PAGE 1
INSTALLATION, OPERATION & MAINTENANCE MANUAL IOM-CA 12-13 MODELS CA-1 AND CA-2 BACK PRESSURE / RELIEF REGULATORS SECTION I I. DESCRIPTION AND SCOPE Models CA-1 and CA-2 are back pressure/relief regulators used to control upstream (inlet or P1) pressure. Sizes for CA-1 – 1/8" and 1/4" (DN6 and DN8); for CA-2 – 3/8" and 1/2" (DN10 and DN15). Both models are bronze bodied units. With proper trim utilization, both units are suitable for liquid and gaseous service.
PAGE 2
connection(s). Fluid will relieve out the bottom connection for Angle or Flow-Thru design and out the other side connection for Globe design (side inlet-side outlet). 9. Regulator may be installed in a vertical or horizontal pipe. 10a. Basic Regulator - (Refer to Figure 1): Regulator may be rotated around the pipe axis 360°. Recommended position is with spring chamber vertical downwards. Orient such that the spring chamber (2) vent hole does not collect rainwater. 10b.
PAGE 3
SECTION V V. SHUTDOWN 1. On systems with a bypass valve, and where system pressure is to be maintained as the regulator is shut down, slowly open the bypass valve while closing the inlet (upstream) block valve. Fully close the inlet (upstream) block valve. (When on bypass, the system pressure must be constantly observed and manually regulated. Close the outlet (downstream) block valve. CAUTION B Do not walk away and leave a bypassed regulator unattended. 2.
PAGE 4
8. Remove diaphragm gasket (12) for metal diaphragm (11). NOTE: No diaphragm gasket (12) for composition diaphragm (11). 9. Clean body (1) and diaphragm flange. NOTE: On regulators originally supplied as “oxygen clean”, Option -5 or Option -55, maintenance must include a level of cleanliness equal to Cashco's cleaning standard #S-1134. Contact factory for details. 10.
PAGE 5
SECTION VII VII. TROUBLE SHOOTING GUIDE 1. Erratic operation; chattering. Possible Causes A. Oversized regulator. B. Worn plug. Remedies A1. Check actual flow conditions, re-size regulator for minimum and maximum flow. A2. Increase flow rate. A3. Decrease regulator pressure drop; decrease inlet pressure by placing a throttling orifice in inlet piping union. A4. Install next step higher range spring. Contact factory. A5. Before replacing regulator, contact factory. B. Replace regulator. 2.
PAGE 6
SECTION VIII VIII. ORDERING INFORMATION NEW REPLACEMENT UNIT vs PARTS "KIT" FOR FIELD REPAIR To obtain a quotation or place an order, please retrieve the Serial Number and Product Code that was stamped on the metal name plate and attached to the unit. This information can also be found on the Bill of Material ("BOM"),a parts list that was provided when unit was originally shipped. (Serial Number typically 6 digits).
PAGE 7
MODEL CA-1 3 4 18 2 4 5 2 6 7 * 8 Option-2 Handwheel 9 10 11 * 12 * 13 * 14 * 15 * 1 Figure 1: Basic Model CA-1 with 3-Connection Flow-Thru Body I Item No.
PAGE 8
MODEL CA-2 Option-5 Cryogenic Construction 3 Installed in horizontal line with spring chamber oriented downwards below the body. Body and spring chamber Item Numbers are identical to Figure 1. 4 2 5 6 7 * 18 3 8 9 * 10 4 19 11 * 2 12 * 13 * 14 * 15 * 1 Figure 1: Basic Model CA-2 with 3-Connection Flow-Thru Body ITEMS NOT SHOWN 16 Closing Cap 20 Closing Cap Gasket 21 Drive Screw Cashco, Inc. P.O. Box 6 Ellsworth, KS 67439-0006 PH (785) 472-4461 Fax. # (785) 472-3539 www.cashco.