CVS Controls 630 HP Manuale di istruzioni - Pagina 5

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Maintenance

WARNING: To avoid personal injury and

equipment damage, isolate the regulator or

relief valve from all pressure. Cautiously

release pressure from the regulator or relief

valve before attempting disassembly.

Due to normal wear that may occur in regulators and

relief valves, parts such as the valve disc, seat ring

and diaphragm must be inspected periodically and

replaced as necessary. The frequency of inspection

and replacement depends upon the severity of

service conditions or federal and provincial laws.

Normal wear of the seat ring and valve disc is

accelerated with high-pressure drops and with large

amounts of impurities in the flow stream.

Instructions are given below for replacing the seat

ring, valve disc and diaphragm. These instructions

may also be used for disassembly required for

inspection and replacement of other parts.

If the loading regulator of pressure-loaded

constructions requires maintenance, disconnect the

supply pressure line (and bleed orifice vent line if

one is present) and unscrew the loading regulator

from its mounting nipple. Refer to the separate

instruction manual for maintenance information.

Seat Ring and Valve Disc:

Note: With some piping systems it may be

possible to omit step 1 below by removing

four cap screws (Key 7) and spreading the

body (Key 1) and adaptor (Key 6) far

enough apart to allow removal of the seat

ring (Key 4) and Type 630 HP valve disc

(Key 3) or Type 630R valve seat O-ring

(Key 32). However, take care to avoid

pinching fingers between body and adapter.

1. Disconnect piping from Adapter (Key 6).

Remove four cap screws (Key 7) and adapter.

2. Remove seat ring (Key 4) and gaskets (Key 5).

3. To remove Type 630 HP valve disc (Key 3) OR

Type 630R valve seat O-ring (Key 32), first

disconnect remote vent pipe (if one is used).

For pressure loaded constructions, disconnect

loading regulator supply line.

4. Unscrew the two cap screws that secure

the diaphragm adaptor (Key 11) to body

(Key 1); remove diaphragm adaptor and

attach spring case (Key 21).

5. Remove valve carrier assembly (Key 2)

from body.

6. To replace seating surface:

6.1. For Type 630 HP, use a ¾" socket

wrench to remove and re-install valve

disc and holder assembly (Key 3).

6.2. For Type 630R, unscrew machine

screw (key31) and remove O-ring

washer and O-ring (Key 28 and 32)

from O-ring holder (Key 3). When

reassembling, apply a good quality

gasket shellac to the machine screw

thread.

7. Use new seat ring gaskets (Key 5) and

body gasket (Key 8) when reassembling.

Insert valve carrier assembly (Key 2) into

the body before re-installing the

diaphragm adaptor.

8. The spring case (Key 21) must point away from

the adaptor (Key 6) on Type 630 HP regulators.

On Type 630R relief valves, the spring case

must face the same direction as the adaptor

(Key 6). Be certain the lever (Key 10) engages

the valve carrier.

Diaphragm

1. Relieve spring compression as follows:

1.1 For spring loaded constructions, loosen

locknut (Key 22). Turn the adjusting screw

(Key 23) counterclockwise until spring

compression is relieved.

1.2 For pressure loaded Type 630R relief valves

(and for pressure loaded Type 630 HP

regulators that have been furnished with a

spring), turn cap screw (Key 23)

counterclockwise until spring compression is

relieved.

2. Disconnect remote vent line (if one is present).

3. For pressure loaded constructions, disconnect

the supply line from the loading regulator (Key

25).

4. Remove spring case (Key 21) by unscrewing

cap screws and nuts (Key 14).

5. Remove diaphragm (Key 13) and attached parts

from lever assembly (Key 10).

6. Unscrew cap screw (Key 18) from connector

head assembly (Key 12) and disassemble the

diaphragm assembly.

7. Install new diaphragm. Note that low-pressure

constructions use a diaphragm plate (Key 16)

on the spring case side of the diaphragm. Low

pressure, pressure loaded constructions use a

diaphragm plate on each side of the diaphragm

plate gasket (Key 33) with each plate. Install

new gaskets when replacing diaphragm.

8. When reassembling, be certain that the

diaphragm connector is engaged on the lever.