Data Sheet

Bulletin 71.1:1301
3

The 1301 Series regulators are direct-operated.
Downstream pressure is registered internally through the
body to the underside of the diaphragm. When downstream
pressure is at or above set pressure, the disk is held against
theoriceandthereisnoowthroughtheregulator.When
demand increases, downstream pressure decreases slightly
allowing the regulator spring to extend, moving the yoke
anddiskassemblydownandawayfromtheorice.This
allowsowthroughthebodytothedownstreamsystem.
As the downstream pressure reach its setting, it started
to overcome the spring force which is sensed by the
diaphragm, moving the yoke and disk assembly up and near
itsorice,restrictingtheowacrosstheregulator.

The 1301 Series regulators may be installed in any position.
Spring case vents must be protected against the entrance
of rain, snow, debris, or any other foreign material that might
plug the vent openings. The inlet connection is marked

 
Body and Spring Case: Forged brass or
CF8M Stainless steel
Bottom Cap: Brass, 304 Stainless steel, or
316 Stainless steel
 Orice: 303 Stainless steel
Valve Disks and Holder: Nylon (PA) and
Zinc-plated brass, PTFE and Zinc-plated brass,
Nylon (PA) and 303 Stainless steel, or PTFE and
303 Stainless steel
 OriceYoke:Brass or 316 Stainless steel
Valve Disk Collar: 304 Stainless steel
Elastomers: Neoprene (CR), Fluorocarbon (FKM),
or Ethylenepropylene (EPDM)
Regulator Spring: Zinc-plated steel
Valve Spring: 302 Stainless steel
Diaphragm Plate: Zinc-plated steel
Adjusting Screw and Bolting: Double Zinc-plated
steel with zinc dichromate overlay
Upper Spring Seat: Zinc-plated steel
Diaphragm: 302 Stainless steel


 
Body and Bottom Cap: CF8M Stainless steel
Spring Case: CF8M Stainless steel
 Orice:316 Stainless steel
Valve Disks and Holder: PTFE and
316 Stainless steel
 OriceYoke:316 Stainless steel
Valve Disk Collar: 316 Stainless steel
Gaskets: Fluorocarbon (FKM)
Bottom Cap O-ring: Fluorocarbon (FKM)
Regulator Spring: Zinc-plated steel
Valve Spring: Inconel
®
X750
Diaphragm Plate: Zinc-plated steel
Adjusting Screw and Bolting: Double Zinc-plated
steel with zinc dichromate overlay
Upper Spring Seat: Zinc-plated steel
Diaphragm: K500 Monel
®
Inconel
®
and Monel
®
are marks owned by Special Metals Corporation.
“In” and the three outlet connections are marked “Out”. If a
pressure gauge is not installed in one outlet connection, plug
the unused connection. See Figure 3 for dimensions.

The 1301 Series regulators have outlet pressure ratings
lower than the inlet pressure ratings. Complete downstream
overpressure protection is needed if the actual inlet pressure
exceeds the outlet pressure rating.
Overpressuring any portion of a regulator or associated
equipment may cause leakage, parts damage, or personal
injury due to bursting of pressure-containing parts or
explosion of accumulated gas. Regulator operation within
ratings does not preclude the possibility of damage from
external sources or from debris in the pipeline. A regulator
should be inspected for damage periodically and after any
overpressure condition.
RefertothereliefsizingcoefcientsintheSpecicationsand
the Capacity Information section to determine the required
relief valve capacity.


(1)




 
   mm  mm
1301F
10 to 75 0.69 to 5.2 1D387227022 Blue 0.200 5.08
1.69 42.950 to 150 3.4 to 10.3 1B788527022 Silver 0.225 5.72
100 to 225 6.9 to 15.5 1D465127142 Red 0.243 6.17
1301G 200 to 500 13.8 to 34.5 1K156027142 Silver 0.331 8.41 1.88 47.8
1. All springs can be backed off to 0 psig / 0 bar.
Table 1. Outlet Pressure Ranges