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|  MIL-P-17869A(SHIPS)
3.4.1.5 Variable delivery control.- Design of all class I and class II
variable delivery pumps shall provide for including reversing control. The
bare control stem or lever and related parts shall have low inertia so as to
contribute toward use of small and compact manual or automatic control operat-
ing devices, Effort to operate the control stem or lever shall be reasonly uniform
on either side of no delivery position. This effort shall be kept to a minimum urn so
as to be of advantage in designing small and compact control operating mecha-
nisms. The type of control operating device furnished and effort figures shall
be as specified (see 6.1). Types of control that may be required are as follows:
(a) Manual push-pull control - This type of control shall
consist of a stem, projecting, through the pump case,
which can be pushed or pulled manually to regulate
pump delivery between maximum and minimum.
(b) Manual rotary handwheel - This type of control shall
consist of a lead screw, projecting through the pump
case, which is fitted with a handwheel suitable for
manual rotation of the screw. By manual rotation of
the handwheel, the pump delivery may be regulated
between maximum amd minimum.
(c) Hydraulic cylinder control - This type of control shall
consist of a hydraulic cylinder actuated by an external
pressure source. By metering oil to the cylinder,
using an appropriate manually or automatically con-
trolled valve, the pump delivery may be varied
between maximum and minimum.
(d) Servo piston control - This type of control shall
consist of a booster or amplifier supplied by an
external pressure source. Linear or rotary move-
ment of the booster control stern manually or by means
of selsyns, solenoids, or other mechanisms as required
by the particular application, may control the pump
delivery from maximum urn to minim urn.
(e) Servo motor or selsyn control - This type of control
shall consist of a lead screw, projecting through
the pump case, which is fitted with a reduction gear
and a small electric motor or power selsyn. By
controlling the operation of the motor or selsyn, the
delivery of the pump may be varied from maximum to
minimum.
(f) Pressure compensator control - This type of control
shall consist of a pressure sensitive device for
automatic regulation of pump delivery to the fluid require-
ments of the system by maintaining pressure at a pre-
adjusted value.
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