Parker PA Series Installation, Operating, & Maintenance Instructions

FLUID CONTROL DIVISION
Parker Hannifin Corporation
95 Edgewood Avenue
New Britain, CT 06051
Telephone (860) 827-2300
INSTALLATION, OPERATING & MAINTENANCE INSTRUCTIONS
WARNING
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.
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.
PA SERIES ANGLE SEAT VALVES
2-WAY NORMALLY CLOSED
2-WAY NORMALLY OPEN
2-WAY NORMALLY CLOSED ANTI-WATER HAMMER
!
It is important that you analyze all
IOM–PA
(Rev 1121)
DESCRIPTION
These valves are 2-way valves. The product line contains both
normally closed (N.C.) and normally open (N.O.) valves in stainless
steel construction. The valves can be actuated pneumatically. The
pilot operated models require a minimum operating pressure
differential to ensure valve operation.
Pilot valves may be ordered separately.
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 seal tightly
against the valve seat. When pressure is applied to the actuator
pilot connection, the piston, piston rod and thus the seating seal are
raised opening the valve.
The valve tightly closes when pressure is removed from the pilot
connection.
The maximum permitted angle seat valve pressure and pilot valve
pressure and temperature ranges are described on the valve
nameplate.
2-way PA Series - NORMALLY OPEN VALVES
The angle seat valve is kept open by a spring which presses
upward on a piston and piston rod forcing the seating seal off the
valve seat. When pressure is applied to the actuator pilot
connection, the piston, piston rod and thus the seating seal are
driven down tightly closing the valve.
The valve opens when pressure is removed from the pilot
connection.
The maximum permitted angle seat valve pressure and pilot valve
pressure and temperature ranges are described on the valve
nameplate.
CAUTION:
A minimum pilot operating pressure is required for
proper angle seat valve operation.
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