1800C & 1800C-HC Service Regulators

General Information:


The 1800C and 1800C-HC Regulators are available as Full Capacity Internal Relief Models. Series 1800C and 1800C-HC Regulators are also available with overpressure shut-off protection.

Available valve body sizes: 3/4" x 3/4", 3/4" x 1", 3/4" x 1-1/4", 1" x 1", 1" x 1-1/4", 1-1/4" x 1-1/4" NPT or BSP-TR. Also available as Offset Valve Body in 3/4" x 3/4", 3/4" x 1", 1" x 1" NPT or BSP-TR.

1800C-HC is available with 1-1/4" valve body only. Maximum inlet pressure, normal service (P1): Depending on orifice size, up to 125 PSIG.

Maximum outlet set pressure, normal service (P2): Depending on spring selection, up to 2 PSIG (56" W.C.).



1. Install, operate, inspect and maintain the regulator as outlined in the following instructions and in accordance with your company's policies and applicable federal, state and local codes and laws. Failure to follow these instructions may result in damage to the regulator or personal injury.

2. Check installation location for suitability. It is possible that physical changes have been made to the building site since the regulator and location were originally selected.

3. Examine regulator for shipping damage.

4. Check regulator and piping for foreign matter which may have accumulated during shipment or handling.

5. Check seal plug information to determine if regulator is suitable for intended service.

6. Suitable stop valve(s) should be installed and should be conveniently located.

7. Filters are available from American Meter for applications where pipeline contaminant’s are suspected to be present.

8. Regulators may be used at temperatures between -20˚ F and +150˚ F (-30˚ C and +65˚ C).


1. Remove all shipping plugs.

2. Use good piping practice. Be sure piping and regulators are free of dirt, pipe dope and other debris. Apply pipe dope to male threads only.

3. Install regulator. Make certain it is piped correctly with inlet pipe connected to the inlet regulator connection and flow is in the direction as indicated by arrow located on valve body (19). The vent should be positioned to prevent entry of water and debris. American Meter recommends that the vent face downward. By removing the two bolts (5), the diaphragm case (8) may be rotated in 90 degree increments in relation to the valve body (19). Replace and tighten the bolts (5). Inside Installations - A regulator installed within a building should be located as near as practical to the point of service line entrance.

4. Turn gas on slowly. If an outlet stop valve is used, it should be open first. Do not overload the diaphragm with a sudden surge of inlet pressure.

5. Assure that there are no leaks and all connections are tight.

6. The 1800C Series regulator is preset at the factory with the diaphragm in the horizontal position and should not require any adjustment if installed in that position. The outlet pressure may vary as much as 0.5" W.C. if the regulator is installed in the vertical position. Should you decide to adjust the set pressure, perform the following:

        (a) Turn gas off and depressurize the system.

        (b) Install outlet pressure gauge. Remove seal plug (14)

         (c) Turn gas on slowly

         (d) Establish a low flow rate - 45 to 55 SCFH.

        (e) Turn pressure spring adjustment screw (9) clockwise to increase outlet pressure or counterclockwise to decrease outlet pressure.

         (f) Establish the set pressure within the range limits of the pressure spring used.

        (g) To test for the regulator's ability to fully shut off (lockup), shut off all flow downstream of the regulator. At lock-up, the outlet pressure will be somewhat higher than the set pressure. However, if the pressure continues to rise after 3 seconds, the regulator must be repaired. Observe for 30 seconds.    

        (h) When the set pressure has been properly adjusted, depressurize and remove gauge(s) and lines.

        (i) Replace seal plug (14).

         (j) Pressurize and check all connections for leaks.



Regulator Pressure Rating

125 PSIG = Maximum recommended inlet pressure for normal service. Maximum recommended pressure may vary with orifice size.

175 PSIG = Maximum inlet pressure for abnormal or emergency service, without causing damage to regulator case.

2 PSIG = Maximum outlet pressure for normal service.

10 PSIG = Maximum outlet pressure which can be contained by pressure carrying components (no flange leakage to atmosphere except for normal relief action). If regulator is subjected to these conditions, it should be removed from service.

50 PSIG = Maximum outlet pressure for abnormal service without damage to internal components. If regulator is subjected to these conditions, it should be removed from service. 2 4 1 3 1800C & 1800C-HC Service Regulators 4 Operation & Resetting The Jeavons USSA: 1. For USSA operations on models 1853C and 1853C-HC w/ Jeavons see brochure SB-8556.

Due to continuous development the information in this document is subject to change.







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1800C & 1800C


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