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FLUID CONTROL DIVISION
Parker Hannifin Corporation
95 Edgewood Avenue
New Britain, CT 06051
Telephone (860) 827-2300
IOM–PR
(Rev 0122)
INSTALLATION, OPERATING & MAINTENANCE INSTRUCTIONS
PA SERIES NORMALLY CLOSED ANGLE SEAT VALVES
WITH DIGITAL POSITIONER AND FEEDBACK
2-WAY NORMALLY CLOSED
GENERAL SAFETY INSTRUCTIONS BEFORE INSTALLATION
FAILURE OR IMPROPER SELECTION OR IMPROPER USE OF
THE PRODUCTS AND/OR SYSTEMS DESCRIBED HEREIN OR
RELATED ITEMS CAN CAUSE DEATH, PERSONAL INJURY
AND PROPERTY DAMAGE.
This document and other information from Parker Hannifin
Corporation, its subsidiaries and authorized distributors provide
product and/or system options for further investigation by users
having technical expertise. It is important that you analyze all
aspects of your application, including consequences of any failure,
and review the information concerning the product or system in the
current product catalog. Due to the variety of operating conditions
and applications for these products or systems, the user, through its
own analysis and testing, is solely responsible for making the final
selection of the products and systems and assuring that all
performance, safety and warning requirements of the application
are met.
The products described herein, including without limitation, product
features, specifications, designs, availability, and pricing, are
subject to change by Parker Hannifin Corporation and its
subsidiaries at any time without notice.
Carefully read Installation, Operation and Maintenance procedures
prior to installing or servicing valve.
Do not use valve as a safety shut-off valve when making repairs.
Do not install a valve before depressurizing system down to
atmospheric pressure.
Care must be taken to ensure that the valve materials selected are
suitable for the media being handled. Parker assumes no liability
for damage caused by improper material selection in the case of
corrosion from aggressive media.
CAUTION: Do not, at any time, make any alteration or
modifications to any angle seat valves without the express and
written approval of Parker’s Fluid Control Division.
DESCRIPTION
These valves are 2-way normally closed (N.C.) valves with stainless
steel construction and are pneumatically actuated, which requires a
24VDC supply power. The positioner adjusts the valve stroke by
monitoring the stem position in relation to the input signal.
PRINCIPLES OF OPERATION
2-way PA SERIES - NORMALLY CLOSED VALVES
The angle seat valve is kept closed by a spring which presses
against a piston and piston rod forcing the seating to seal tightly
against the valve seat. When pressure is applied to the actuator
pilot connection, the piston, piston rod, and seating seal are raised
thus opening the valve.
The valve closes tightly when pressure is removed from the pilot
connection.
The maximum permitted angle seat valve pressure, pilot valve
pressure, and temperature ranges are described on the valve data
label.
CAUTION: A minimum pilot operating pressure is required for
proper angle seat valve operation.
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