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3.4 Maintenance

3.4.1 The required maintenance interval will vary depending

on application. The user must establish a suitable mainte-

nance depending on the operating conditions. Prior to disas-

sembly remove all system pressure from the regulator.

Before starting the above operation, make sure the recom-

mended spare parts are available (Figs.1-2-3-4-5, parts list).

3.4.2 Disassembly (see Figs.1-2-3-4-5).

3.4.2.1 Actuator Disassembly

Remove spring compression by unscrewing the adjustment

screw (13) (counter-clockwise) after loosening the locknut

(14). The position of the locknut should be noted to allow clos-

er preliminary adjustment when reassembling. If the regulator

is equipped with a sealed cap (Fig.4), first remove the cap (28)

and gasket.

Remove the spring case (11) by loosening the nuts (19). Note;

it is not necessary to remove the housings on actuator sizes

220 and 360.

Remove the spring. Unscrew the nut (16).

Remove the diaphragm and washers.

3.4.2.2 Body Disassembly

Unscrew and remove the blindhead (1) with gasket. Unscrew

the seat (25) with a screwdriver (see Figs. 1, 2 and 5).

Pull the plug off its guide and remove it from the body.

3.4.2.3 Parts inspection

All the components are now ready to be inspected. Replace

any worn items. Clean all parts.

Pay particular attention to the condition of the disk and plug,

both elastomeric and metal, and the seat.

If the seat is worn, it may be able to restore it by lapping

using a metal disk and abrasive paste.

The diaphragm should be replaced if it shows any damage. The

same applies to Teflon diaphragm protector (if equipped).

Gaskets should not be re-used.

If preferred, the regulator may be returned to an authorized

Masoneilan repair center to be reconditioned.

3.4.2.4 Reassembly

Carry out the disassembly operations in reverse order.

Push the stem of the plug into body and push it into its guide.

Tighten the seat (25), making sure the washer is new and cor-

rectly positioned. Replace the small retention ring (10) after

thoroughly cleaning its seat.

Install the diaphragm, taking care to install the protector (9), if

applicable, underneath, towards the regulator body on top of

lower diaphragm plate (20). Install upper diaphragm plate (7)

and the spring guide (17) and fully tighten nut (16).

Instructions

EY0173 – 10/08

173 Series

Self-Operating Pressure Regulators

Align the holes of the diaphragm with those in the actuator

flange and install the spring, spring holder and spring case.

Install blindhead (1). Return the adjusting screw (13) to the

position marked by the nut (14) or the position noted (see

3.4.2.1). Exact adjustment must be checked when the regulator

is returned to service.

3.4.2.5 Diaphragm Replacement

The diaphragm may require replacement without having to

make other repairs. If the regulator is easy to access and

isolate, it can be replaced while leaving the regulator installed

in the piping provided it can be isolated. In this case, isolate

the regulator and vent all pressure. Ensure isolation valves

are locked to prevent accidental pressurization will working on

the regulator. Remove the actuator following the instructions

in section 3.4.1.2.

Replace and install the diaphragm and reassemble the actua-

tor as shown in section 3.4.2.4. Check calibration once more

when the regulator is returned to service.

When welding piping, do not attach the earth connector to the

regulator as this may damage important sliding parts.