Cashco POSR-2 Manuel d'utilisateur télécharger pdf (Page 2)

IOM-POSR-22

10. See Figure 2 for installation ori en ta tion for

hor i zon tal or vertical piping. For best per for -

mance Cashco rec om mends in stall ing in a well

drained horizontal pipe, prop er ly trapped.

Position “H”: Horizontal Pipe. Re quires user

to in stall sensing line on down stream pip-

ing.

Position “VD”: Vertical pipe with down wards

ﬂ ow direction. Requires user to install

sensing line on down stream pip ing.

Position “VU”: Vertical pipe with up wards

ﬂ ow di rec tion. Pilot valve and main valve

shipped as separate units. Re quires user

to install pilot valve at down stream pipe tap

with a pipe nipple (not provided), provide

and install tub ing (4 tube ﬁ ttings and two 4

ft (1.2 m) lengths of 1/4" OD copper tubing

supplied) to load ing cham ber tap and to

body tap from pilot valve.

11. Recommended installation is with pilot valve

spring chamber vertical upwards. Orient such

that the spring chamber vent hole does not

collect rainwater or debris.

12. Regulators are not to be buried under-

ground.

13. For insulated piping systems, rec om men da tion

is to not insulate regulator.

ing down stream. This increases the loading

pres sure on the main valve’s plug and opens

valve. Partially closing the pilot valve’s plug will

reduce its ﬂ ow to less than the amount bleed ing

downstream, and allows the loading pres sure

on the main valve’s piston to decay, allowing

partial closing of the main valve’s plug. This

continues until steady-state is de vel oped.

4. The pilot valve’s diaphragm(s) senses the

down stream (P

) pressure and compares

the force generated to the force developed

by the pilot’s range spring.

5. If, during operation, the downstream (P

)

pres sure falls below the pilot valve’s setpoint,

the main valve’s piston senses the reduced

pres sure on its underside and instantly moves

down, increasing the ﬂ ow through the main

valve. At the same time, the pilot valve senses

the reduced pressure and the pilot valve’s plug

SECTION III

7. In placing thread sealant on pipe ends prior

to en gage ment, assure that excess material

is removed and not allowed to enter the reg u -

la tor upon start-up.

8. Flow Direction. Install so the ﬂ ow direction

match es the ﬂ ow arrow on the body.

9. The POSR-2 comes factory piped between

the pilot supply and pilot loading. Install an

external sensing line from the 1/4" NPT con-

nec tion opposite the factory piped pilot load ing

port to a point downstream at gauge location;

use 1/4" OD metal tubing for dis tanc es 4 ft

(1.2 m) or less, and 3/8" OD metal tubing (re-

quires 1/4" x 3/8" tubing adapter) for distances

greater than 4 ft. (1.2 m). The sensing line

should always be sloped down ward so that

condensation will drain away from the pilot.

If regulator pipe line is ex pand ing to a larger

pipe line, always connect sens ing line to the

larger pipe line.

III. PRINCIPLE OF OPERATION

A. General:

1. The POSR-2 pilot obtains its operating me di um

from the main valve body inlet. Down stream

pressure (P

) registers on the un der side of

the main valve’s piston and the pilot valve’s

diaphragm(s).

2. The loading pressure on the top side of the

main valve’s piston is an intermediate pres sure

higher than the downstream (P

) pres sure by

the sum of the pressures required to overcome

the main valve’s plug unbalance force and the

piston spring’s force.

3. The pilot has a bleed oriﬁ ce that continu-

ously bleeds part of the loading medium

down stream. In op er a tion, the pilot valve’s

plug can ﬂ ow more medium than is bleed-

CAUTION

DO NOT HYDROSTATIC TEST THROUGH AN IN STALLED

UNIT, INCLUDING PILOT; ISOLATE BOTH PILOT AND MAIN

VALVE FROM TEST. The upper range spring pressure

level listed on the nameplate is the rec om mend ed “upper

operative limit” for the sens ing diaphragm(s) in the pilot.

Higher pres sures could cause internal damage. In addition,

note on the name plate that the Inlet and Outlet pressure

and tem per a ture ratings are at different levels.

1 2 3 4 5 6 7 ... 19 20

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Cashco POSR-2 Manuel d'utilisateur Page 2

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