Cashco POSR-2 Manuel d'utilisateur télécharger pdf (Page 12)

IOM-POSR-212

57. Rig the reassembled main valve (MV) for

over head hoisting. Re move temporary duct

tape. Lift and remove from vise.

E. Joining:

1. Place main valve body (1) into vise, oriented

to allow correct positioning of pilot valve (PV)

and interconnecting piping. See Figures 6, 7

& 8.

SECTION VII

VII. LEAK TESTING

A. General:

1. A POSR-2 is a metal-to-metal seated de sign

with standard hardened trim in main valve

(MV) and pilot valve (PV).

2. Both pilot valve (PV) and main valve (MV)

are of a ﬂ ow-to-close design, and can be seat

leakage tested without extensive setup.

3. There are two design pressures for a

POSR-2; one for the higher inlet pressure

zone, and another for the lower outlet pres-

sure zone.

Recommended Test Pressures –

Inlet: 100 psig (7.0 Barg).

Outlet: 15 psig (1.03 Barg) for Pilot with

5–15 psig (0.34–1.03 Barg) spring

range.

Outlet: 40 psig (2.7 Barg) for Pilots with

(Cont.) 15–150 psig (1.03–10.3 Barg) spring

ranges.

B. Seat Leakage – Pilot Valve (PV):

1. Separate pilot valve (PV) from main valve

(MV), see Section VI, subsection B.

2. Install a temporary 1/4" - NPT pipe plug into

the (P

Int

) connection.

3. Install a hose ﬁ tting and hose into the 1/2"

FNPT connection port of the pilot valve (PV)

body (1). Place other “open” end of the hose

at the bottom of a glass container having

approximately 1/8" (3 mm) of water depth.

NOTE: Pilot valve (PV) and glass container

should be at about the same elevation.

4. Relax the range spring (15) by rotating the

ad just ing screw (19) CCW (viewed from above

ad just ing screw) until fully loose. Keep track of

the num ber of rev o lu tions in the box below:

2. Place thread sealant on threaded ends of pipe

nipples (19, 29 and 30) and on street elbow

(27). Ensure that excess material is removed

and not allowed to enter the regulator upon

start-up.

3. Reconnect pilot valve (PV) to main valve (MV)

using appropriate pipe nipple(s) and ﬁ ttings

(19, 26, 27, 28, 29 & 30). Using a pipe wrench,

ensure that all connections are tight and in

proper orientation.

4. Reinstall interconnecting tubing (21) be tween

main valve (MV) cylinder head (4) and pilot

valve (PV) body (1).

5. Leak test the combined unit per Section

VII.D.

No. of Revolutions adjusting screw ro tat ed:

__________________

Main Valve

Body Size

Torque

in (DN) ft-lbs (N-M)

1" (25) 25–30 (33-40)

1-1/2" (40) 25–30 (33-40)

2" (50) 70–75 (94-101)

3" (65) 100–110 (135-149)

4" (100) 150–160 (203-216)

5. Connect temporary air supply with in-line ad-

just able airset regulator to P

2

outlet of pilot.

Slow ly pres sur ize the pilot valve (PV) while

ob serv ing the jar with water. Bring pres sure

to 50 psig (3.4 Barg). Wait a min i mum of ﬁ ve

min utes. Ob serve for leak age of bubbles in the

water jar. If the number of bub bles is greater

than one (1) per minute, the leakage is at the

point where trim re place ment is rec om mend ed.

(Rec om mend pres sure in teg ri ty test per sub-

section D. herein.)

6. Remove leak test apparatus. Reconnect pilot

valve (PV) to main valve (MV) using ap pro -

pri ate pipe nipples, tubing and ﬁ ttings (19, 20,

26, 27, 28, 29 & 30). Ensure all connections

are tight and in proper orientation.

1 2 ... 7 8 9 10 11 12 13 14 15 16 17 18 19 20

Commentaires sur ces manuels

Pas de commentaire