Armstrong GP-2000 Kurulum, Kullanım ve Bakım Kılavuzu - Sayfa 2

Kontrol Ünitesi Armstrong GP-2000 için çevrimiçi göz atın veya pdf Kurulum, Kullanım ve Bakım Kılavuzu indirin. Armstrong GP-2000 8 sayfaları. Pressure reducing valves
Ayrıca Armstrong GP-2000 için: Manuel (8 sayfalar), Manuel (2 sayfalar)

Sayfayı Yazdır

Armstrong GP-2000 Kurulum, Kullanım ve Bakım Kılavuzu

Improper sizing or adjustment of the pressure reducing valve may cause hunting, scale problems, water hammer, etc.

and can heavily damage the main parts of the valve. Adjust the valve as follows:

1. Close the gate valves before and after the pressure

reducing valve and blow fluid leisurely through the by-

pass line. Adjusting the opening of the by-pass globe

valve so as not to blow the safety relief valve. After

draining, be sure to close the by-pass globe valve.

2. Loosen the lock nut and adjusting screw to relieve the

pressure on the adjusting spring.

3. Slowly open the inlet side gate valve to the full open

position, and open the outlet side gate valve enough

so that a little fluid can flow through.

4. Slowly turn the adjusting screw clockwise until the

desired pressure is obtained while watching the

pressure gauge at the outlet side.

Note: Before disassembly, check to make sure that the valves before and after the reducing valve are closed, including

the valve in the control pipe. Also, make sure that the pressure has been relieved and that the valves are holding.

A. Disassembly of the Pilot Valve

Ref: (Fig. 3-1)

1. Loosen the (28) lock nut, turn the adjusting screw (27)

counterclockwise and turn until pressure is relieved

from spring.

2. Remove the hex head bolts (37) and take out the top

spring plate (25), adjusting spring (24), bottom plate

(26) and two (2) pilot diaphragms (23). (1 diaphragm if

1.5-3 spring)

3. Remove the (18) pilot valve capsule [hexagonal part at

the center of the (2) pilot body. Disassemble pilot valve

capsule ñ place a 7/32î socket over small hexagonal

screw in middle of capsule (21) and hold opposite end

with a flat head screwdriver. Turn counterclockwise to

unscrew and expose valve stem and seat.

B. Disassembly of the Main Valve

1. Disconnect the copper tubing on the side of the valve

(30A), (30B), and (30C).

1. Check to make sure there are no scratches on the

main valve, valve seat or pilot valve. If there are no

scratches apply lapping compound and re-lap the valve

and seat. (See Bulletin AY-768).

2. Make sure the sliding parts (Pilot valve stem and main

valve stem) move freely.

3. Never-Seeze

gasket compound should be used on

both main diaphragms and on bottom of pilot dia-

phragms.

Start-Up and Adjustment Procedures

Disassembly

Assembly

5. Slowly open the outlet side valve to the full open

position.

6. After adjustment, tighten the lock nut.

Note: Downstream usage must be present in order to set

any pressure-reducing valve.

Table 2-1. Spring Chart

Reduced Pressure

*1.5 - 3 psig

3 - 21 psig

15 - 200 psig

*When using this spring range, remove one (1) pilot diaphragm.

Capacities are reduced by 1/2 when this spring is being used.

2. Remove the four hex head bolts (38) from the pilot

body (2) to remove the pilot from the main body (1). If

the pilot is mounted remotely, remove the bolts to the

main valve top cover. Care should be taken when doing

this ñ the main valve is held by a spring, which is

compressed. Once bodies are apart, remove spring

plate retainer (14), screen (15), main valve spring (13)

and main valve (6).

3. If the seat must be replaced, remove the four nuts (40)

that attach the main body (1) to the top diaphragm

case. The main valve seat is tightened from the bottom

side of the body using a ìTî bar. Loosen with ìTî bar

and unscrew main valve seat from the top.

C. Disassembly of the Main Diaphragm

1. Remove all bolts (41) holding the top and bottom

diaphragm cases (4 & 5) together.

2. Separate both halves. Remove both main diaphragms

(12), retainer (11) and main spindle (9).

4. Assemble valve in reverse order from disassembly.

5. Tighten bolts uniformly (criss-cross pattern).

6. Verify if your valve has old or new type tubing to assure

proper placement of orifices (see page 6).

7. Be sure fitting 30A, 30B, 30C and tee fitting (33) are in

the correct position and not over tightened.

Ref. Figure 6-1.

8. Make sure copper pilot valve gasket (22) and main

valve seat gasket (8) are in place before tightening pilot

valve capsule and main valve seat.

Color Code

Yellow

Green