Cashco 1000 HP Basic - Manual (Page 8)

8 IOM-1000HP-Basic
the seat disc screw (26) into the seat disc
(25); the seat disc (25) should lay fl at with
no rounded sur face. A mech anical aid is
nor mal ly not required; hand-tightening is
nor mal ly suf fi cient.
7. If utilized, place piston spring (30) over
small er end of cylinder (21).
8. Insert piston assembly (24 metal seat; 24,
25 and 26 comp. seat) into end of cylinder
(21).
9. Place piston collar (23) over end of piston
(24), ensuring that the spherical surface of
the piston (24) and the piston collar (23) bear
against each other.
10. Clean the body (1) cavity through the open-
ings. Clean the “jet area” just inside the body
(1) outlet end through which the piston (24)
projects. Clean all parts to be reused. NOTE:
On valves originally sup plied with Option
1000-55, “ox y gen clean”, main te nance must
in clude a level of clean li ness equal to Cashco,
Inc's., cleaning standard #S-1134. Contact
factory for details.
11. Use special care cleaning the fl at mating
sur fac es of the body (1) and cylinder (21)
shoulder, as this pressurized joint is metal-
to-metal with no gasket.
12. Lubricate the cylinder (21) threads lightly with
thread sealant. Insert the entire trim stack
into the body (1) opening and screw until
tightly seated. Using the ham mer and wrench
handle, impact the cylinder (21) into the body
(1). NOTES: 1. Take special pre cau tion to
keep piston collar from getting “cocked” at an
angle when inserted. 2. On 2" brass bodies
(1) with brass trim, a TFE body O-ring (43) is
utilized to seal between the body (1) and the
cylinder (21) sub-as sem bly.
13. Inspect the body (1) outlet end to ensure
that the piston (24) is located nearly concen-
tric to the body (1) bore in the jet area with
clear ance. Under no conditions should the
piston (24) be touching the body (1). Use
two pencils or similar shafts to place in inlet
and outlet ends of regulator and alternately
push on each end of the piston (24) to ensure
free movement. (Total move ment is ap prox i-
mate ly 1/8" (3 mm).)
14. Bench test unit for suitable operation and seat
leakage. NOTE: Regulators are not nor mal ly
tight shutoff devices. Pressure must build
above setpoint for best shutoff.
15. Soap solution test around cylinder (21)-to-
body (1) con nec tion for leakage. Test pres-
sure should be a minimum of 100 psig (7.0
Barg) at the inlet, or actual service con di tions
if high er.
VII. TROUBLE SHOOTING GUIDE
SECTION VII
1. Erratic operation, chattering.
Possible Causes Remedies
A. Oversized regulator; inadequate rangeability. A1. Check actual fl ow conditions, resize for minimum and maximum fl ow.
A2. Increase fl ow rate.
A3. Decrease pressure drop; decrease inlet pressure by placing a throttling
orifi ce in inlet piping union.
A4. Replace full orifi ce with reduced orifi ce; i.e. new cylinder required.
B. Worn piston/cylinder; inadequate guiding. B. Replace trim.
C. Flow induced instability. C1. Get straight runs of piping (5 diameters upstream, 10 downstream)
to and from regulator.
C2. Ensure outlet velocity is not excessive; use pipe reducer close to regulator outlet.
C3. Add next higher range spring. Contact factory.
C4. If composition diaphragm, switch to metal diaphragm.
D. Improper (oversized) jet. D. Replace existing piston with new piston with proper jet.
E. Plugged trim. E. Remove trim and check for plugged holes in piston, or debris in guide
zone or jet zone.