Types 67, 67H, 67HR, 67R, 67SS, and 67SSR
3
A regulator may vent some gas to the
atmosphere. In hazardous or flammable
gas service, vented gas may accumulate
and cause personal injury, death, or
property damage due to fire or explo-
sion. Vent a regulator in hazardous gas
service to a remote, safe location away
from air intakes or any hazardous area.
The vent line or stack opening must be
protected against condensation or
clogging.
3. A clogged spring case vent hole may cause the
regulator to function improperly. To keep this vent hole
from being plugged (and to keep the spring case from
collecting moisture, corrosive chemicals, and other
foreign material) orient the vent to the lowest possible
point on the spring case or otherwise protect it. Inspect
the vent hole regularly to make sure it has not been
plugged. Spring case vent hole orientation may be
changed by rotating the spring case with respect to the
regulator body. A Type 67, 67H, 67HR, 67R, 67SS, or
67SSR regulator with a tapped spring case may be
remotely vented by first removing the vent screen if used
(key 47, figure 3) and installing obstruction-free tubing
or piping into the 1/4-inch NPT vent tapping. Provide
protection on a remote vent by installing a screened
vent cap into the remote end of the vent pipe.
4. For use in regulator shutdown, install upstream and
downstream vent valves or provide some other suitable
means of properly venting the regulator inlet and outlet
pressures.
5. If using pipe, apply a good grade of pipe compound
to the pipe threads before making the connections.
6. Install tubing or piping into the 1/4-inch NPT inlet
connection on the body assembly (key 1, figure 2 or 3)
and also into the 1/4-inch NPT outlet connection,
unless this connection already has been factory-piped
to another unit.
Startup and Adjustment
Key numbers are referenced in figure 2 for a Type 67,
67H, 67HR, or 67R regulator and in figure 3 for a Type
67SS or 67SSR regulator.
1. With proper installation completed and downstream
equipment properly adjusted, slowly open the upstream
and downstream shutoff valves while using pressure
gauges to monitor pressure.
2. Regulator outlet pressure may be monitored on a
gauge installed at some point downstream from the
regulator. Or, outlet pressure may be monitored on a
gauge (key 21, not shown) installed on the body of a
regulator with a tapped side outlet. If the regulator has
no gauge but the side outlet is tapped and plugged, the
pipe plug (key 21, figure 3) may be removed and a
gauge temporarily installed for monitoring.
To avoid personal injury, property dam-
age, or equipment damage caused by
bursting of pressure containing parts or
explosion of accumulated gas, never
adjust the control spring to produce an
outlet pressure higher than the upper
limit of the outlet pressure range for that
particular spring. If the desired outlet
pressure is not within the range of the
control spring, install a spring of the
proper range according to the dia-
phragm parts maintenance procedure.
Note
Each regulator is factory-set for the
pressure setting specified on the order. If
no setting was specified, outlet pressure
was factory-set at the midrange of the
control spring.
3. If outlet pressure adjustment is necessary, monitor
outlet pressure with a gauge during the adjustment
procedure. The regulator is adjusted by loosening the
locknut (key 11, if used) and turning the adjusting screw
or handwheel (key 10) clockwise to increase, or coun-
terclockwise to decrease, the outlet pressure setting.
Then tighten the locknut (if used) to maintain the
adjustment position. On some regulators, a closing cap
(key 28, figure 3) must be removed before adjustment
and replaced afterward.
Shutdown
First close the nearest upstream shutoff valve and then
close the nearest downstream shutoff valve to vent the
regulator properly. Next, open the vent valve between
the regulator and the downstream shutoff valve nearest
to it. All pressure between these shutoff valves will be
released through the open vent valve, since a Type 67,
67H, 67HR, 67R, 67SS, or 67SSR regulator remains
open in response to the decreasing downstream
pressure.
