Specifications

WESTLOCK CONTROLS CORPORATION
280 N. MIDLAND AVE., STE. 258, SADDLE BROOK, NJ 07663 TEL: [phone] FAX: [phone]
westlockcontrols.com
4/7/10 TECH-382/D.W.O. 17072 Page 8 of 15
D/C - Dual Coil Option
Four way valves are available with solenoid actuators on both ends of the
Falcon valve, coil “A” and coil “B”, for fail-last logic. When only coil “A” is
energized, the valve will shift as a standard 4-way does. If coil “A” is then de-
energized, the valve will remain in this last position. The valve will not return
to the original state until coil “A” is de-energized and coil “B” is
energized. The process is the same for coil “B”.
NOTES - For Dual Coil Valves
1. The valve may be in either position upon installation. Refer to the Air
Flow Diagrams (Fig. 2) and energize the appropriate coil (with air) to
reset valve to the desired position.
2. Dual coil valves require both an electrical signal and air pressure to
operate. See Air Flow Diagram for air pressure requirements. If either
or both inputs are lost the valve will remain in its current position.
3. Both coils should never be energized simultaneously.
4. If using overrides on a dual coil valve, the coils must be de-energized.
4.2.4. Plumbing and Air Supply Considerations
Air mains and lines should be sized, routed and pitched properly to avoid
excessive pressure loss (more than 10% of applied pressure at maximum
flow), air flow restriction or condensed moisture at the point of usage. Proper
filtration of air supply per specifications in section 4.2.1 is critical to prevent
premature failure of solenoid valves. If lubricators are used in the air line,
use appropriate oil distribution equipment and oil grades, such as ISO and
UNI FD22. The performance and life of pneumatic valves may be affected by
air supply conditioning methods. Regulation of inlet pressure to within
specified limits is also critical to prevent excessive seal wear, failure by
extrusion or leakage. In general, pipe fittings should not be assembled to a
specific torque because the torque required for a reliable joint varies with
thread quality, port and fitting materials, sealant and other factors. Fittings
should not be over-tightened or distortion and, most likely, complete valve
failure can result. The following general procedure should be followed:
1. Inspect port and connectors to ensure that the threads are free of dirt,
burrs and excessive nicks.
2. Apply sealant/lubricant or Teflon tape to the male pipe threads. With any
sealant or tape, the first one or two threads should be left uncovered
and care must be taken to avoid the application of excessive sealant
media to avoid system contamination.
3. Install connectors into ports and wrench tighten per the fitting
manufacturer’s recommendation to achieve an air-tight joint.