a) Remove the relief valve end cover
assembly from the pump. Before doing so
make a note of the position of the 'Direction
of Flow' arrow.
b) Remove the adjusting screw (135).
c) Hook the spring (132) out from the top of
the housing (133). Alternatively turn the
valve upside down and tip the spring out.
d) Remove the 2 screws (136) and remove
the housing (133).
e) The valve seat (128) and diaphragm (129)
will come off of the end cover (125) together
with the housing. To disassemble these tap
the end of the guide pin (134) with a soft tool
eg a screwdriver handle. The valve seat,
diaphragm and piston/guide pin assembly
should now separate from the housing.
f) Remove the O-ring (126) from the groove
in the valve seat.
Inspection:
a) Inspect the condition of the diaphragm.
Look for splits, cracks or other signs of wear
and fatigue. Replace as necessary.
b) Inspect the conical end of the piston (131)
around the screw thread and around the
outside edge of the cone to ensure there are
no sharp edges or burrs.
Re-assembly:
a) Lay the end cover (125) on its face.
b) Fit the O-ring (126) into the groove in the
face of the valve seat (128). Use a suitable
grease to 'stick' the O-ring in the groove.
c) Turn the valve seat upside down and place
the seat onto the end cover with the O-ring
towards the end cover ie the conical face
uppermost. Position the 2 screw holes in the
valve seat over the corresponding threaded
holes in the end cover.
Ensure that the X marked on the side of
the seat is aligned with the X on the end
cover.
d) Place the diaphragm onto the seat.
Pumps fitted with Viton or PTFE pump
head elastomers use a PTFE faced
fluoroelastomer diaphragm. Ensure
that the PTFE side is face down i.e.
PTFE face is in contact with the valve
seat.
e) Hold the housing (133) upside down and
slide the piston/guide pin assembly into the
housing, guide pin first. Place a finger into
the thread end of the housing and hold the
guide pin by pushing on its side. Turn the
housing over so that the widest end is
lowermost.
f) Place the housing / piston / guidepin
assembly over the diaphragm / valve seat /
end cover assembly such that the 2 holes
align with the holes in the diaphragm.
g) Push the 2 screws (136) through the holes
in the housing so that they locate into the
threaded holes in the end cover.
h) Loosely tighten the screws.
i) Fit the spring and adjusting screw and
tighten the screw until it contacts the spring.
j) Tighten the 2 retaining screws (136) to the
correct torque.
k) The valve is now assembled and can be
re-fitted to the pump.
Ensure that the 'Direction of Flow'
arrow is in the previously noted
position.
Page 33
Hy~Line and Ultima Lobe Pumps
07/03
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