Instruction Manual

Type 912N-HNRUL
2

Inlet pressure ows through the open orice into the
regulator body and pressurizes the cavity formed
by the body and diaphragm assembly. When
downstream demand is reduced, the pressure under
the diaphragm increases. This pressure overcomes
the regulator setting (which is set by a spring) and
moves the diaphragm assembly upwards. This
upward motion is transferred to the lever which in
turn closes the disc holder/disc against the orice
and reduces gas ow. If a higher volume ow rate
is demanded downstream, the pressure under the
diaphragm decreases. The control spring force
pushes the diaphragm assembly downward, lifting
the lever which moves the valve disc away from the
orice allowing more gas into the downstream piping.

!























The Type 912N-HNRUL regulator has an outlet pressure
rating lower than the inlet pressure rating. Downstream
protection is required if the actual inlet pressure can
exceed the regulator outlet pressure rating or the
pressure rating of any downstream equipment.
Regulator operation within ratings does not preclude the
possibility of damage from external sources or from debris
in the lines. A regulator should be inspected for damage
periodically and after any overpressure condition.
Ensure that the regulator is undamaged and contains
no foreign material. Install the regulator so that the
ow through it leaves the outlet port (marked on the
1. The pressure/temperature limits in this Instruction Manual or any applicable standard limitation should not be exceeded.

1/4-inch NPT
3/8-inch NPT


250 psig (17,2 bar)

0.073-inch (1,9 mm)


14-inches w.c. (35 mbar) Non-Adjustable

Sealing valve and closing cap can maintain 20 psig
(1,4 bar) pressure




20 psig (1,4 bar)

 3 psi (0,21 bar differential)
above outlet pressure setting


-20° to 160°F (-29° to 71°C)

Internal

1/8-inch NPT 

1.30 pounds (0,6 kg)