Groth 1401E User Manual

Page 11

The seat bushing [34] forms a metal to metal seal
against the body. Make sure the sealing surfaces are
smooth and the seat bushing torqued down firmly.
Replace the seat O-Ring [27] if it is damaged.
Replace filter [17] if it is damaged or plugged. Place
filter inside inlet port and use a 1/2" diameter round
bar or similar tool and push filter into place. Do not
hammer in or damage may result. Install the bug
vent but do not tighten until after testing. Place body
gasket [41] on top of body [42] and align with all
nine holes in body.

The disc [33] seals against the soft seat and it has a
polished finish. The finish must be free of nicks and
scratches. Recondition disc if sealing surface finish
is damaged. Place on lapping machine until nicks
and scratches are removed. If the disc is
fluoropolymer coated, the coating must be smooth
and not chipped. Replace the disc if coating is
damaged. Place a small amount of lubricant in the
ball cavity. Install O-Ring [32] outside of the ball
cavity. Attach the disc to the stem with the stem
screw [26]. Use a 9/64" hex key to tighten the screw.
Do not over tighten the screw or swiveling will be
eliminated, causing leakage due to disk/seat
misalignment. Position stem assembly in the body
cavity. Slip body diaphragm [40] on stem assembly
and place on top of body gasket. Properly align with
all nine holes in gasket and body. Place the lower
actuator housing [39] over the body diaphragm and
align with all nine holes and the stem. Install the
eight hex bolts [16], and tighten. Place the gasket
[10] on the lower actuator housing. Stack the
components over the stem in the following order:

Lower fluoropolymer washer [25]
Lower spacer [31]
Another fluoropolymer washer [25]
Lower diaphragm [15]
Lower support plate [38]
Central spacer [30]
Spacer [11]
Upper diaphragm [15]
Fluoropolymer washer [25]
Upper support plate [37]
O-Ring [28]
Spring guide [29]

Make sure the step of the guide is centered

in the hole of the support plate.

Lock washer [24]
Hex nut [23]. Do not tighten hex nut.
Gasket [10]
Upper diaphragm case [9]

Align all holes on the gasket, the upper diaphragm,
the spacer ring, the lower diaphragm, and the gasket,
with the lower diaphragm case. Install the (12) bolts
[12], with the lock washers [14], the hex nuts [13],
and tighten.

Fig. 12 Stem Sub - Assembly

Now tighten the stem nut. A wrench should be used
to hold the flats at the tip of the stem while the nut
[23] is being tightened to prevent torque on the
diaphragms. Place the spring [6] on top of the spring
guide [29]. Then the spring button [5]. Place a small
amount of grease in the cup of the button where the
adjustment screw point will be bearing.

Place the gasket [35] on top of the upper actuator
housing [9]. Then the spring bonnet [4] with the bug
vent [7]. Install the hex bolts [8] and tighten evenly.
Lightly grease and thread the adjustment screw [2]
and the jam nut [3] on the spring bonnet. Reset the
pilot valve to the desired set point within the set
range of the spring. See the setting and testing
section of this manual. Tighten jam nut after setting
is achieved. And finally install the cap [1].

NOTE

The pilot valve may be pre-set independent of the
pressure relief valve if suitable setting equipment is
available. If equipment is not available, the pilot
must be reinstalled on the relief valve and the pilot
set by pressurizing the relief valve inlet. Field testing
may be accomplished if the relief valve assembly is
equipped with the required test connections. See the
setting and testing section of this manual.