© MOOG 2010
This document is subject to MOOG INTELLECTUAL AND PROPRIETARY INFORMATION LEGEND . The details are on page II.
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MRJ04410
1-5-6.
MANIFOLD
The manifold must be mounted using as close as possible to the cylinder. Ideal methods are to mount the
manifold directly on the cylinder, sealing the ports with “O” rings or to use tubing between the cylinder and
manifold.
The pressure and return connections should be straight thread fittings using an “O” ring as a seal. Tapered
thread fittings are not encouraged as they tend to leak and when they are torqued up to stop the leak, the
servovalve mounting surface is distorted, causing leakage at the servovalve-manifold seal. Straight thread
fittings using “O” rings do not leak or cause mounting surface distortion.
Should tapered thread fittings be used, ONLY Teflon tape can be used on the tapered threads as a sealant.
The Teflon tape must not cover the last two threads at the smaller diameter portion of the thread. Any
other material will cause eventual contamination problems.
“
Figure 1-9
” shows two possible methods of adjusting the positional relationship between the tooling ac-
tuator and the tooling die gap closed position. Tooling motion stops may be required to limit the forces on
the die gap tooling when the die and mandrel touch. “
Figure 1-10
” is a typical installation.
Tooling motion stops may also be required to insure a die gap opening on a continuous molding machine. An
inadvertent closure of the die gap could cause very high pressures in the extruder barrel and extrusion
head and result in their damage and/or failure. The above comments must be considered for the proper
installation of either a Moog supplied die gap tooling actuator or a customer supplied actuator.
1-5-7.
SERVOVALE MOUNTING
The servovalve is mounted to a manifold with four mounting
screws and using four “O” rings to seal the Pressure, Return
(Tank), and the two Cylinder hydraulic connections.
The “O” ring seal between the servovalve and manifold depends
upon the servovalve mounting manifold surface flatness to insure
that there are no oil leaks. This surface must be flat within
0.025mm and have a √32 RMS finish.
Two servovalves mounting patterns are available: a Cetop 5, NG
10 or a Ø22,2mm, Moog 76 port circle.
1-5-8.
TOOLING ADJUSTMENT
When a mold change is made, it is often necessary to change the
die gap tooling assembly. Therefore the actuator installation must
provide for simple adjustment of the die gap tooling position
relative to the actuator position.
The extruder barrel and/or screw can be severely damaged if the tooling die gap closes when
the extruder is running. A mechanical motion stop must be installed which will not allow the
die gap to close.
Figure 1-11 G631-XXX Servovalve
