Powers restrictors are available in a variety of orifice sizes and connection types.
External types feature:
Air filter.
Threaded connection (Type 1).
Barbed connection (Types 2 and 3).
Color coding (Types 2 and 3).
Airflow direction arrow to minimize installation errors.
Airflow restrictor capacity molded (Types 2 and 3) or stamped (Type 1) on
body.
External restrictors are used:
for one-pipe transmitters, 40 scim (11 ml/sec).
when installed tubing lengths exceed maximum recommended value.
and 2.
for one-pipe room thermostats, 20 scim (5.5 ml/sec).
with check valves to provide airflow time delays.
Slow to supply, fast to exhaust.
Fast to supply, slow to exhaust.
for VAV vortex control. Use 80 scim (22 ml/sec) restrictor in actuator control
pressure line to prevent cycling.
when other air capacities, 10 scim (2.7 ml/sec), 80 scim (22 ml/sec) or 320 scim
(87 ml/sec), are required to compensate for tubing size or response time.
Specs
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Material:
Copper
Connection Type:
Threaded
Contact
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