General Information

The American Meter Series 1800CPB2 pressure regulator is designed for natural gas applications and features a compact, lightweight design for fast, easy installation.

The 1800CPB2 regulator consists of a main regulator and a pilot regulator. It is a downstream bleed, pressure loaded regulator, designed to provide stability of operation for precise and constant outlet metering pressure control.

The regulator is capable of handling varying inlet pressures up to 125 PSIG while controlling a set constant outlet pressure (1 to 30 PSIG) within  ±1% of the absolute set pressure over a wide range of flow rates.

The main regulator is normally closed, furnished with one spring (for all outlet pressures) to close the regulator if loading pressure fails. The pilot regulator outlet line mounts to the main regulator vent and connection tubing brings the main regulator inlet pressure to the pilot regulator inlet.

The pilot regulator (one spring controls all outlet pressures from 1 PSIG to 30 PSIG) is used to load pressure on the diaphragm of the main regulator. Adjustment of the pilot regulator depends upon the inlet pressure and outlet pressure range desired. The pilot regulator using upstream pressure as its supply, reduces this pressure to a predetermined value and then loads the main regulator diaphragm. The loading pressure overcomes the force of the main regulator spring causing the main regulator to open.

Overpressure Shut-Off Regulators
Model 1883CPB2 regulators are compact units designed to regulate line pressure and to provide protection against any downstream overpressure.

Rugged, Compact OPSO Operates independently. The OPSO will shut off the gas supply in the event of a serious downstream pressure build-up.

Adjustable Overpressure Shut-Off Pressure is adjustable via the overpressure shut-off adjustment screw to settings from 5 to 15 PSIG and 15 to 40 PSIG depending on spring selected.

Application

The 1800CPB2 regulator is designed for pressure reducing service requiring stability and metering accuracy. They are used on gas distribution systems as intermediate or low pressure regulators. They are also effective for large farm and commercial operations with widely varying inlet pressures up to 125 PSIG with accurate control of outlet pressures between 1 PSIG and 30 PSIG. 1800CPB2 regulators are excellent for use with American Meter large capacity meters as well as with American Meter domestic meters. Model 1883CPB2 is equipped with overpressure shut-off (OPSO) that provides protection against downstream overpressure (see page 7).

The 1800CPB2 regulator will accurately control the metering pressure to a constant value, thus the pressure correction factor becomes a constant factor for a given metering pressure. The pressure-corrected volume equals meter volume multiplied by the pressure factor constant.

Pressure Rating

125 PSIG (8.6 bar) = Maximum recommended inlet pressure for normal service. Maximum recommended pressure may vary with orifice size.
175 PSIG (12 bar) = Maximum inlet pressure for abnormal or emergency service, without causing damage to regulator case.
30 PSIG (2 bar) = Maximum outlet pressure for normal service.
45 PSIG (3.1 bar) = Maximum outlet pressure which can be contained by pressure carrying components (no flange leakage to atmosphere). If regulator is subjected to these conditions, it should be removed from service.
50 PSIG (3.5 bar) = Maximum outlet pressure for abnormal service without damage to internal components.
If regulator is subjected to these conditions, it should be removed from service.
Corrosion Protection

Construction

Lower Diaphragm Case - Precision die-cast aluminum with an exclusive seven-step advanced conversion coating, single-coat polyester primer and high solid polyurethane top coat.
Top Assembly - Precision die-cast aluminum with an exclusive seven-step advanced conversion coating, single- coat polyester primer and high solid polyurethane top coat.
Valve Body - Cast grey iron, undercoated, single-coat polyester primer and high solid polyurethane top coat.
Closing Spring - Steel, zinc plated and yellow chromate. Color coded for identification.
Diaphragm Plate - Steel, terne plated.
Seat Disc - Buna-N.
Orifice - Super high strength, corrosion-resistant, aluminum.
Lever - Steel, zinc plated and yellow chromate.
Vent Screen - Stainless steel.
Seal Plug - Precision, die-cast aluminum.