Hale Torrent SVS Stainless Steel Valves - Manual (Page 93)

1.O PREFACE
This instruction manual is designed to be an aid to the valve maker and the end
user. It is not intended to be a fully comprehensive document, as it would not be
practical to cover all the possible applications.
2.0 UNIT DESCRIPTION
2.1 The basic unit comprises of a 90
°, 180° or 360° worm box. The high ratio
reduction ensures back driving from the valve cannot occur and gives low
input torque for high output torque. Input drive can be handwheel or
electric/hydraulic/pneumatic actuator.
2.2
Reduction spur boxes can be added to the input face to increase the
ratio. This is a standard feature on the larger units. The spur boxes can
be single, double, triple or quadruple reduction.
2.3 Ancillary items are often supplied to customer requirements.
Common features are:
a) Padlock
flanges
b) Declutch
mechanisms
c) Friction locks (input or output)
d) Pedestals mounted on input or output faces
e) Electrical/mechanical limit switches
f) Chainwheels for remote operation
g) 90
° mitre boxes
h) Extended shafts and bearing arrangements
i) Output torque plugs
j) Output adaptor flanges
k) Lever arms
l) Traveling nut stops
Refer to the Opperman Mastergear catalogue for details.
3.0 SAFETY
3.1 At any time when maintenance is carried out on an actuator, the pipeline
should be depressurized and drained.
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