SM-1200.40
DESCRIPTION
The THD-2-FM CONTROLAIR Valve, designed for marine
service, is a handle operated two engine pressure control
and directional control valve. It contains two PILOTAIR®
Valves, which are arranged to furnish inlet air pressure to
two directional control lines and a pressure regulating
portion to furnish graduated pressure to a third control
line.
The selection between the two directional control lines
depends upon handle movement to either side of
"Neutral" position. The pressure in the graduated control
line is proportional to the position of the handle in either
quadrant.
The L-shaped handles are designed so that both units
can be operated by one hand. Both handles are equipped
with an adjustable friction brake to hold the handles in any
selected position in the travel arc.
WARNINGS - INSTALLATION
AND MOUNTING
The user of these devices must conform to all applicable
electrical, mechanical, piping and other codes in the
installation, operation or repair of these devices.
INSTALLATION! Do not attempt to install, operate or
repair these devices without proper training in the
technique of working on pneumatic systems and
devices, unless under trained supervision.
Compressed air systems contain high levels of stored
energy. Do not attempt to connect, disconnect or
repair these products when a system is under
pressure. Always exhaust the pressure from an air
system before performing any service work. Failure to
do so can result in serious personal injury.
MOUNTING! Devices should be mounted and
positioned in such a manner that they cannot be
accidently operated.
TECHNICAL DATA
Maximum Inlet Pressure=200 psi (13.8 bar)
Outlet Pressure=(according to model)
Ambient Temperature= -40
0
F (-40
0
C) to 160
0
F (71
0
C)
Medium=Compressed air
Port Size=
¼
" NPT
The THD-2-FM CONTROLAIR Valve is designed for
panel mounting. The valve may be installed and removed
from the top. See Figure 4 for panel opening and
thickness dimensions. All piping connections are made to
removable pipe brackets. Piping connections need not be
broken to remove the valve for service. Loosen bolts to
remove the CONTROLAIR Valve.
The supply ports have strainers in them and will protect
the internal valving from large particles of foreign material
in the lines, but it is recommended that a standard 10
micron air line filter be installed in the piping to the IN
ports (Ref. no 2, Figure 2.) on pipe brackets of the THD-2-
FM CONTROLAIR Valve.
MAINTENANCE
Maintenance periods should be scheduled in accordance
with frequency of use and the working environment of the
THD-2-FM CONTROLAIR Valve. No special tools are re-
quired to maintain the THD-2-FM CONTROLAIR Valve.
One complete CONTROLAIR Valve should be kept in
stock for each four valves in service. During the main-
tenance period, replace a complete valve with the standby
unit. This will reduce operational time loss and afford
inspection and replacement of worn parts at a more
opportune time and location.
Notice that the operating portions of the valve can be
removed without disturbing the pipe connections. Remove
the valves from the pipe brackets by loosening bolts (ref.
4) and lift the valve free.
Completely disassemble the CONTROLAIR Valve. Wash
all metal parts in a non-flammable solvent and all rubber
parts with soap and water. Rinse each part thoroughly
and blow dry with a low pressure air jet. Arrange the
parts on a clean white surface in the order of the exploded
view.
Examine each part carefully. Flex the diaphragm and
packing rings. If cracked or worn, replace them. Replace
all parts that may not provide satisfactory service until the
next scheduled maintenance period.
As reassembly proceeds, lubricate individual parts by
using No. 107 Lubriplate on metal-to-metal surfaces and
No. 55 Pneumatic Grease (Dow Corning) on all rubber
seals except Ref. no. 37. Equivalent greases to those
recommended can be used.
Store the reconditioned CONTROLAIR Valve in a
moisture-proof bag.
THD-2-FM CONTROLAIR
®
VALVE
PART NO.’S R431000720 (Old Part No. P -027121-00101)
R431000721 (Old Part No. P -027121-00109)
SERVICE INFORMATION
