Bulletin 2537-M3/USA
Service Bulletin
Series FM
Hydraulics
Effective: April 1, 2000
Supersedes: November 11, 1996
Hydraulics
II
Parker Hannifin Corporation
Hydraulic Valve Division
Elyria, Ohio 44035 USA
Manapak Flow Control Valves
Series FM
Bulletin 2537-M3/USA
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 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.
WARNING
The items described in this document are hereby offered for sale by Parker Hannifin Corporation, its subsidiaries or its authorized distributors. This offer and its acceptance are governed
by the provisions stated in the "Offer of Sale".
Copyright 1996, 2000, Parker Hannifin Corporation, All Rights Reserved
Offer of Sale
Hydraulics
III
Parker Hannifin Corporation
Hydraulic Valve Division
Elyria, Ohio 44035 USA
Contents
Manapak Flow Control Valves
Series FM
Bulletin 2537-M3/USA
Series FM2
Service Parts Information ................................................................................................................................ 1
Ordering Information ....................................................................................................................................... 1
Series FM3
Service Parts Information ................................................................................................................................ 2
Ordering Information ....................................................................................................................................... 2
Series FM6
Service Parts Information ................................................................................................................................ 3
Ordering Information ....................................................................................................................................... 3
Operation .............................................................................................................................................................. 4
Trouble-Shooting .................................................................................................................................................. 4
Hydraulics
1
Parker Hannifin Corporation
Hydraulic Valve Division
Elyria, Ohio 44035 USA
Manapak Flow Control Valves
Bulletin 2537-M3/USA
fm.p65,dd, am
Technical Information Series FM2
Service Parts Information
Ordering Information
Hydraulics
2
Parker Hannifin Corporation
Hydraulic Valve Division
Elyria, Ohio 44035 USA
Manapak Flow Control Valves
Bulletin 2537-M3/USA
fm.p65,dd, am
Technical Information
Series FM3
Ordering Information
Service Parts Information
Hydraulics
3
Parker Hannifin Corporation
Hydraulic Valve Division
Elyria, Ohio 44035 USA
Manapak Flow Control Valves
Bulletin 2537-M3/USA
fm.p65,dd, am
Technical Information
Series FM6
Service Parts Information
Ordering Information
Hydraulics
4
Parker Hannifin Corporation
Hydraulic Valve Division
Elyria, Ohio 44035 USA
Manapak Flow Control Valves
Bulletin 2537-M3/USA
fm.p65,dd, am
Technical Information Series FM
Operation
The function of a flow control valve is to control the
rate of fluid flow in its leg of the circuit. It performs its
function by being a higher than normal adjustable
restriction for the system. In the control flow direction,
a check valve forces the flow through a variable
orifice needle valve. The standard needle provides
fine adjustment for the first three turns and coarse
adjustment for the last three turns. In the free flow
direction, an increase in pressure, overcoming the
pressure of the spring, will open up the check allow-
ing flow through the check and the variable orifice.
This allows for high flow at a low pressure drop.
Option fine and microfine needle are available
providing finer control. However, use of these options
will also decrease maximum flow capability through
the valve.
Trouble-Shooting
Symptom Cause Solution
Improper flow rate
Needle valve
Readjust needle valve.
adjustment incorrect
Restrictions in valve
Disassemble and flush system.
passages or orifice areas
Valve installed backwards
Reverse connection.
Broken spring
Replace spring.
Hydraulics
Catalog 2537-M3/USA,
2M, 4/00, PHD
Parker Hannifin Corporation
Hydraulic Valve Division
520 Ternes Avenue
Elyria, Ohio 44035 USA
Tel: (440) 366-5200
Fax: (440) 366-5253
Web Site: http://www.parker.com/hydraulicvalve
