Cashco DA6 User Manual

Page 11

IOM-DA6

SECTION IX

SECTION VIII

Figure 7: Opt-81 — Composition Diaphragm

Construction, 2" and Smaller

Figure 8: Opt-81 — Metal Diaphragm

Construction, 2" and Smaller

3. Pressure Containment Test.

a. Pressurize inlet, outlet and cover dome

to 150 psig with air or GN

b. Soap solution test all external leak points;

plugged connections, diaphragm fl ange
and di a phragm bolting.

4. Excessive leakage will require disassembly,

examination of sealing elements, correction
of problem, reassembly and retesting.
NOTE: This valve is NOT a bubble-tight
shutoff de vice. See DAG-TB, Table DAG-10
for leak age classes.

VIII.PRESSURE LOADING

1. Loading pressure can be supplied using various schemes. Please reference DA6/P-LOAD-TB for the schematics

of these various schemes, in clud ing:

• pressure unloading using BPV
• pressure loading using PRV
• pressure loading using I/P transducer

IX. TROUBLE SHOOTING GUIDE

When trouble shooting this regulator there are many possibilities as to what may be causing problems. Many
times, the regulator itself is not defective, but one or more of the accessories may be. Sometimes the pro cess
may be causing diffi culties.

The key to effi cient trouble shooting is information and communication. The customer should try to be as precise
as possible in their explanation of the problem, as well as their understanding of the ap pli ca tion and operating
con di tions.

Figure 9: Opt-81 — Composition

Diaphragm, 2-1/2" – 4"