Type 250 Lock-up Air Relay

Reliability for fail in place applications of control valves when air supply drops below acceptable pressure levels.

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Reliability for fail in place applications

The ControlAir Type 250 Lockup Air Relay is a reliable unit for fail in place applications of control valves when air supply drops below acceptable pressure levels. Valve or damper position is maintained by capturing air pressure inside the diaphragm chamber (or piston cylinder) of the actuator, when the supply pressure falls below the desired set value.

Specifications

Port Size (Inlet, Outlet, Supply)

1/4″ NPT

Cut-off Pressure Range

15-60 psig (1-4 BAR)
30-120 psig (2-8 BAR)

Supply Pressure

125 psig (8.35 BAR) maximum

Temperature Limits

0° to 160°F (-18° to 71°C)

Weight

Aluminum: 2.1 lbs (0.95 kg)
Stainless Steel: 4 lbs (1.8 kg)

Materials

Housing: Diaphragm:
Spring:
Plug:
Trim:

 Aluminum or 304
Nitrile/Nylon
Plated Steel
Stainless Steel/Nitrile
Stainless Steel

Ordering

Part
Number
Port Size
(NPT)
Set Point Range 
 Factory Set Point Range Construction
250-AA
1/4″
15-60 psig
(1-4 BAR)
22 psig
(1.5 BAR)
Aluminum
250-BA
1/4″
30-120 psig
(2-8 BAR)
85 psig
(5.8 BAR)
Aluminum
250-AS
1/4″
15-60 psig
(1-4 BAR)
22 psig
(1.5 BAR)
Stainless
Steel
250-BS
1/4″
30-120 psig
(2-8 BAR)
85 psig
(5.8 BAR)
Stainless
Steel

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