Pilots

The actuator pilot shall open or close the controlled system via an external control signal. Actuator pilot shall be avaialble in both fail open or fail closed upon loss of signal. Actuator pilot shall mount outside the main valve and provide remote on/off operation for a wide rage of control variables.

The combination of a Spence Type N with a Spence Type E main valve produces a differential pressure regulator in a single pilot-operated valve. Type N is designed to control the pressure of the fluid discharged at a constant, adjustable differential above some separate source of pressure.

The A Series air adjusted pilots, when combined with a Main Valve, will control a steady or varying inlet pressure to a constant delivery pressure. The pilots can control either pressure or temperature.

Spence Pressure Regulator is a combination of D Series pilot and a Type E main valve. This regulator reduces a steady or varying initial pressure to a constant, adjustable delivery pressure.

The Type P125 trip stop pilot is used in conjunction with a Spence main valve. This combination is known as a trip stop valve. Type P125 is a manually resettable trip pilot that, once “tripped”, results in the closing of a Spence main valve; therefore preventing further overpressure of the downstream system. The trip pilot is set at a pressure slightly greater than the desired delivery pressure. This setting procedure is completed at the factory before the pilot is shipped.

The Q Series pilot is separated from the main valve and connected to it with a male union. It is normally closed, designed with packless construction and interchangeable on all sizes of main valves. A strainer screen shall be built into the pilot inlet. These regulators are designed to maintain a constant back pressure by discharging excess flow to a lower system pressure or atmosphere. The EQ Series are intended primarily for steam service and provide dead-end shutoff. A Spence™ back pressure regulator is not a safety valve and should never be used as such.

Complete pressure regulator with safety pilot includes Type E Main Valve or Type D pilot and Type SP/P Safety Pilot.

ET124 and ET134 Series are steam pressure reducing valves and temperature regulators in a single pilot-operated valve. These regulators are combination of Type T124 or T134 pressure and temperature pilot and a Type E or E2 main valve. Steam pressure on the heater is modulated in proportion to temperature and load variations. Pressure control provides fast, accurate adjustment of heat transfer rate to demand requirements.

The Spence Type T14 is a temperature pilot regulator. When combined with the Spence Type E or Type C Main Valve, it produces a temperature regulator, ET14, or a combined pressure and temperature regulator in a single pilot operated valve, ET14D. Type T14 pilot is recommended for use with storage heaters, jacketed kettles and vats.

The T61 Series Temperature Controller is ideal for wide ranging, fast changing loads on instantaneous heaters and other difficult process applications. The cascade principle, normally used only on instrument type regulators, is the basis for this design. T61 Series, used with a properly selected A Series Pilot or Control Valve, continuously adjusts a pressure regulator to the required heater pressure. This action, coupled with the fast response of a bimetallic thermostat, gives exceptional results. Added convenience and economy results from the wide (200°F / 93°C) adjustable range and the low air consumption (0.35 cfm / 0.59 m3 /h). These controllers have adjustable proportional band as well as over temperature protection.

In steam systems, it is essential to turn steam on slowly to prevent shocking the piping system, which could result in damaged or broken piping and equipment. This Electronic Time Controller (ETC), when used with Type VH210 Pilot mounted to a Main Valve, will perform this operation automatically, eliminating the need for a technician to slowly open a supply valve manually. In some applications, slow shut down is also needed.