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Hoffman Specialty Products General Catalog
8200 N. Austin AveMorton GroveMorton GroveIL 60053IL 60053USAUSATel 847 966-3700Tel 847 966-3700Fax 847 965-8379Fax 847 965-8379
Series 2000 Pilot-Operated Regulators
Operation / Characteristics / Hoffman Specialty Product Features

Series 2000 Pilot-Operated Regulators consist of a main valve that is controlled by a single or combination of pilot control valves. The Hoffman Specialty Series 2000 Pilot-Operated Regulator line includes over 55 main valves with 24 pilots and hundreds of possible combinations to cover a wide range of temperature, pressure and capacity options.

There are a number of types of pilot control valves available from Hoffman Specialty:

Different types of pilot valves can be used in combination to control more than one function or as a safety override. For example, a temperature pilot may be used in conjunction with a spring pressure pilot to control both temperature and pressure. Or, a temperature pilot may be used with a solenoid pilot to provide automatic shutdown when an over-temperature condition occurs.

Operation of Series 2000 Pilot-Operated Regulator Main Valve:

The regulator main valve is held closed by the pressure on the diaphragm from an internal main spring. Pilot control valves control steam flow from the upstream supply side of the main valve to the underside of the diaphragm of the main valve. When the pilot valve opens, steam flows through the pilot and pressure builds in the signal line, applying pressure under the main valve diaphragm. This pressure force compresses the main valve spring and the main valve opens.

Under constant steam demand, the pilot and main valve remain relatively motionless. As the system approaches the pilot set point, the pilot valve begins to close. Less steam passes through the pilot and through the signal line. Pressure in the signal line decreases as steam passes through a small bleed orifice on the main valve. With lower steam pressure under the main valve diaphragm, the main valve spring forces the main valve to close.

(Shown in closed position)

Characteristics of Series 2000 Regulator Main Valve:

  • Steam service only.
  • Single-seated, normally closed design.
  • Can control multiple function with one main valve by using multiple pilot control valves.
  • Maintains accurate and stable control of pressure or temperature.
  • Inlet pressure:
  • Model 2100, 2200, and 2300          
  • Model 2150 and 2250
20 psi (1.3 bar) minimum
30 psi (2.0 bar) maximum
  • Minimum differential pressure:
  • Model 2100, 2200, and 2300
  • Model 2150 and 2250
15 psi (1.0 bar)
3 psi (0.2 bar)
  • Maximum pressure differential:
  • Model 2100, 2200, and 2300
150 psi (10.3 bar)*
                * A 2-stage reduction should be used for pressure drops greater than 100 psi (6.9 bar)
  • Model 2150 and 2250
30 psi (2.0 bar)
  • Maximum temperature 450 F (232 C)

Features of Hoffman Specialty Series 2000 Regulator Main Valves:

  • 2-ply stainless steel diaphragm provides greater accuracy of control over entire capacity range and a longer life.
  • Available in through 6 inch sizes.
  • 3 interchangeable, stainless steel port and seat sizes:
    • Full for maximum capacity
    • Normal
    • Reduced for smaller load conditions
  • For continuous or dead-end service within .01% leakage of the main valve’s rated capacity.
  • Packless construction eliminates many service problems.
  • Positive travel stop and back up of diaphragm prevents over pressurizing from downstream (low-pressure) side.
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