WATER LEVEL CONTROLS
PUMPS AND PARTS
PRESSURE RELIEF VALVES
FIRING RATE MOTORS
PRESSURE SWITCHES & CONTROLS
- Belimo Non-Spring Return Actuators
- Belimo Spring Return Actuators
- Honeywell Non-Spring Return Actuators
- Honeywell Spring Return Actuators
- Johnson Controls Non-Spring Return Actuators
- Johnson Controls Sping Return Actuators
- Schneider Electric Non-Spring Return Actuators
- Schneider Electric Spring Return Actuators
- Siemens Non-Spring Return Actuators
- Siemens Spring Return Actuators
PNEUMATIC DAMPER ACTUATORS
DIGITAL PANEL METERS
ANALOG PANEL METERS
VARIABLE AREA FLOW METERS
CORIOLIS MASS FLOW METERS
PADDLE WHEEL FLOW METERS
TURBINE FLOW METERS
VORTEX FLOW METERS
LEVEL METERS AND TRANSMITTERS
BW CONTROLS RELAYS
- Honeywell 7866 Thermal Conductivity Analyzer
- Honeywell Thermal Conductivity Cells
- Honeywell HPW7000 Hi-pHurity Water System
- Honeywell pH ORP Electrodes
- Honeywell UDA2182 Analyzer
- Honeywell Toroidal (Electrodeless) Conductivity
- Honeywell Dissolved Oxygen
- Honeywell Directline Analyzer and Sensors
- GF Signet pH/ORP
- GF Signet Conductivity & Resistivity
- GF Signet Turbidity
- GF Signet Multi-Parameter Controller
INDUSTRIAL FIXED GAS DETECTION
PORTABLE GAS DETECTION
Remote Electronic Temperature Controls
Remote Bulb Temperature Controls
Limit Controls & Freezestats
BUILDING AUTOMATION SYSTEMS
OTHER FIELD DEVICES & ACCESSORIES
PNEUMATIC SENSORS & CONTROLS
EP, IP, PE SWITCHES AND TRANSDUCERS
AIR STATION EQUIPMENT
General Purpose Gauges
Low Pressure Gauges
Differential Pressure Gauges
- Pressure Gauge Accessories
COMMERCIAL HVAC VALVES
- Belimo Globe Valves
- Belimo Ball Valves
- Belimo Butterfly Valves
- Belimo Zone Valves
- Erie Pop Top Zone Valves
- Honeywell Globe Valves
- Honeywell Zone Valves
- Invensys Barber Colman Globe Valves
- Johnson Controls Globe Valves
- Johnson Controls Ball Valves
- Johnson Controls Butterfly Valves
- Siemens Globe Valves
- Siemens Ball Valves
- Siemens Butterfly Valves
- Siemens Zone Valves
- Maxitrol Gas Regulator Valves
- Apollo Ball Valves
- Conbraco Pressure Relief Valves
- Condensate Drain Valves
- Dragon Valves
- Hancock Forged Steel Globe Valves
- JD Gould Valves
- NEWCO Forged Gate, Globe and Check Valves
- NEWCO Trinity Valve
- Newmans Gate, Globe and Check Valves
- Plastomatic Ball Valves
- Tasco Bronze Globe Valves
- Triac Ball Valves
- Warren Controls Valves
- Watts Safety Relief Valves and Accessories
- Yarway Blow-Off Valves
- Yarway Hy Drop Valves
- Yarway Steam Traps and Parts
- Yarway Welbond Valves
Relays and Control Modules
The 141 Positioning Switch is used to deliver any manually selected pressure over a range of 0 to 30 psi (0 to 207 kPa) to air-operated equipment. The adjustment knob can be left free to rotate or held in position by snapping the locking ring.
The 243 Multi-purpose Relay is pneumatic auxiliary devices designed to provide a variety of pneumatic control functions for the typical control system.
The 243 Balance-retard Relay is gradual-acting, pneumatic devices designed to provide special functions such as balancing, signal retard, hesitation, and pressure limiting.
The 243 Analog Relays are pneumatic auxiliary devices designed to assist the engineer in obtaining specialized control action within a pneumatic control system.
The 243 Switching Relay is a compact three-way air valve that can be used to perform a variety of switching and diverting functions
The 243 Reverse Acting Relay provides a proportional output signal that varies inversely with the input signal. A spring adjustment is provided to allow setting a desired reverse acting schedule required by a particular application.
A dual input, single output logic device, the 243 Highest Pressure Signal Selector, is used in pneumatic control systems to compare pressure signals.
The 243 Lowest and Highest Signal Selector is a six-input, dual output logic device for use in pneumatic control systems
The 786 Selector Switch is used to deliver or stop the flow of compressed air to selected controllers valves, or dampers in commercial applications. The common port may be connected to two or three ports depending on the switch model.
Pneumatic 1:1 ratio direct acting relay is used to limit minimum or maximum output pressure. The AKR-40605 can also be used as a manual positioner, 1:1 ratio relay, or lowest of two pressures selector. Relay will also increase the capacity of a controller (except when used as maximum output limiter or lowest pressure selector).
Setpoint adjuster and scale plates used to provide remote setpoint adjustment of RKS-2001, RKS- 4002, and RKSR-4000 receiver-controllers. May also be used to manually pilot pneumatic relays.
For applications where an electrical circuit is used to control a pneumatically operated device. Used to direct supply air to a pneumatic device when the coil is energized or de-energized depending on the supply and exhaust air connections. May be used for selection or diverting applications.
Three-way air switching valve is used for central supply air changeover in dual pressure systems.
For applications where an electrical circuit is used to control a pneumatically-operated device. Used to direct supply air to a pneumatic device when the coil is energized or de-energized, depending on the supply and exhaust air connects.
For applications where an electrical circuit is used to control a pneumatically operated device. Used to direct supply or control air to pneumatic devices when the coil is either energized or de-energized, depending on the supply and exhaust air connections.
The C-2040 Averaging Cumulator is a low volume output device designed to operate a controlled device or receiver-controller by averaging the output signals of two, three, or four controllers or transmitters. The Cumulator produces an output signal equal to the average of the input signals. Refer to C-2040 Averaging Cumulator Product Bulletin (...
The C-2220 High-Low Pressure Selector selects and transmits control pressure signals from a group of thermostats or controllers. The selector is available in either high or low volume output modules. The appropriate C-2220 module must be selected to work with either high or low volume thermostats or controllers. The C-2220 High-Low Pressure...
The C-5222 Adding/Subtracting Repeater is a low volume output auxiliary device designed to increase or decrease the output pressure of a transmitter at a constant ratio. Models are available with a 1:1 or 5:1 ratio. Refer to C-5222 Adding/Subtract Repeater Product Bulletin (LIT-7171425) for important product information.
The C-5226 Pneumatic Signal Transmitter repeats pneumatic transmission signals or selects the higher or lower of two pneumatic signal levels directly from the output of a controller. The C-5226 may also be used as a high or low signal limiter or a differential switchover device. Refer to C-5226 Pneumatic Signal Transmitter Product Bulletin (LIT...
The C-9200 Pneumatic Sequencing Cumulator provides sequential operation of controlled devices that are operated by the same control signal. The cumulator may also be used to correct changes in spring ranges of controlled devices caused by pressure or other external forces. Refer to C-9200 Pneumatic Sequencing Cumulator Product Bulletin (LIT-...
The C-9500 Two-Position Pilot Cumulator switches its output from zero to full input pressure at a pre-selected pressure. The cumulator provides for two-position action from a proportional control signal. Refer to C-9500-1 Two-Position Pilot Cumulator Product Bulletin (LIT-7171445) for importnt product information.
The C-9504 Two-Position Cumulator provides a two-position output signal from a proportional input signal. The output can be powered by either the supply pressure or the input signal. The appropriate configuration is chosen in the field. Refer to C-9504 Two-Position Cumulator Product Bulletin (LIT-7171450) for important product information.
The C-9506 Air Switching Cumulator switches output pressure from zero to full supply pressure when the pilot pressure reaches the switch point. Refer to C-9506 Air Switching Cumulator Product Bulletin (LIT-7171455) for important product information.
The KMC CCE-3001 is a single-stage pneumatic-electric relay designed for applications where a single pneumatic single requires one predetermined air pressure setting to actuate an electrc switch. The CCE-3002 is a two-stage pneumatic-electric relay, and the CCE-3003 is a three-stage pneumatic-electric relay. These relays are designed for...
The R-2080 Booster Relay operates as a pneumatic repeater and volume amplifier. The pilot signal is repeated at its output at a 1:1 ratio. Refer to R-2080 1:1 Booster Relay Product Bulletin (LIT-7171460) for important product information.
The R-3030 Reversing Relay functions as a 1:1 pneumatic inverter, volume amplifier, and inverse sequencer. The R-3030 includes an integral mounting bracket and sheet metal screws for surface mounting. Refer to R-3030 Reversing Relay 1:1 Ratio Product Bulletin (LIT-7171465) for important product information.
The R-4000 Miniature Pressure Regulator provides a method to readjust the setpoint of pneumatic controllers in low volume applications. The output pressure varies in proportion to the rotation of the adjusting knob. Refer to R-4000 Miniature Pressure Regulator Product Bulletin (LIT-7171360) for important product information.
The pressure selector relays are designed for use in pneumatic control systems where the application requires the comparison, selection, and transmission of the higher or lower of two proportional signals. R432-11 can also be used as a booster relay.
The R503-1 and R503-2 diverting relays are snap-acting devices with adjustable setpoints. They are designed for a variety of switching and interlocking functions in pneumatic control systems where the application requires one or more of the following functions: feeding and exhausting branch lines, diverting a supply line to either one of two...
The R504 Series diverting relays are snap-acting devices designed for a variety of switching and interlocking functions in pneumatic control systems where the applications may require one or more of the following functions: feeding and exhausting branch lines, diverting a supply line to either one of two branch lines or diverting either one of...
The reversing relay is a proportioning device designed for use in pneumatic control systems where the application requires the reversing of a proportional signal from a controlling device. The R516 branch line pressure decreases in direct proportion to an increase in input signal pressure and also amplifies the volume of air available for the...
The electric-pneumatic relays are three-way, two-position, electrically activated air valves for use in pneumatic control systems where the application requires a variety of switching, diverting, or interlocking functions, actuated by an electrical circuit. The R527 Series switches one SPDT pneumatic circuit, while the R528 Series are designed...
The volume booster relay is a proportioning device designed for use in pneumatic control systems where the application requires amplifying the volume of control air to final control devices. System transmission lag is minimized by using this relay in conjunction with a proportional controller operating several diaphragm valves or damper...
The selector relay is a device designed for use in pneumatic control systems where the application requires the comparison, selection, and transmission of the highest and/or the lowest of up to six pneumatic input signals. All input ports are “dead-ended” and no signal air passes through the relay to the output ports.
The signal repeating relay is a proportioning device for use in pneumatic control systems where it is desirable to repeat a pneumatic signal accurately, such as the output signal from a pneumatic transmitter which must be transmitted to receiver controllers or indicators at multiple locations. In addition to accurately repeating the input...
The summation relay is a proportioning device for use in pneumatic control systems where the application requires the addition of two pneumatic signals. The branch line pressure increases in direct proportion to the sum of the two input signals and amplifies the volume of air available for the final control device, thereby minimizing system lag...
The averaging relay is a proportional device designed for use in pneumatic control systems where the application requires operation of a final control device, or some other control action such as resetting a receiver controller, by the average of the signals from two pneumatic devices. The relay also amplifies the volume of air available to...
Pilot capacity reversing relays designed for reversing a proportional signal from a controlling device. Factory adjusted to decrease branch line pressure as the input pressure increases. Comes with a bias adjustment and two factory calibration points (8 and 9 psi).
The RCC-1010 is an adjustable ratio relay designed for sequencing pneumatic control components in HVAC systems. It can reduce the rate at which a pneumatic device responds to a control signal. This ratio may be adjusted on a percentage basis from zero on up to 1 to 1. This feature can be used to reduce instability of a final control device by...
The RCC-1111 multiple input selector relays are designed for selection of the lowest and/or highest of six different pneumatic inputs. They are restricted devices designed for pilot-duty operation. If a large output volume is required, a volume booster relay should be used. For applications requiring a “low” output, the integral...
These main valve capacity reversing relays are designed for reversing a proportional signal from a controlling device. They’re factory adjusted to decrease the branch line pressure as the input pressure increases. A bias adjustment is provided to retard or advance the output if required. Use where the desired output signal to the...
These main valve capacity relays are designed for use in pneumatic control circuits. RCC-1505/1506 are addition relays for adding 2 signals up to 30 psig (207 kPa). They are intended for use in systems where the output signal to the controlled device is to be the sum of the 2 different source signals. RCC-1507/1508 are subtraction relays for...
These relays are proportional main valve capacity booster devices. They are designed for pneumatic control circuits when amplifying the volume of control air in the circuit is necessa ry. System transmission lag is minimized when used in conjunction with a proportional controller operating several diaphragm valves or actuators. Two models are...
RCC-1511 and 1512 are main valve capacity ratio relays designed to provide an output signal in proportion to the input. Each 1 psi change to the input yields a 2 psi change to the output. They are used in pneumatic control circuits when the final control device must be controlled by a signal that is proportionally different from the source...
RCC-1513 and 1514 main valve capacity averaging relays are proportional devices designed to average two signals in pneumatic control circuits. They are used where the desired output signal to the controlled device is to be the average of two different source signals. The air output volume is also amplified thereby minimizing system lag. Their...
Three-port relays used in HVAC systems to perform a variety of relay functions; transmit the higher of two input signals, lock out one pressure signal when a second signal is higher, or transmit the lower of two pressure signals. Replacement devices are available for Johnson, Powers, Robertshaw, Barber-Colman, and older Honeywell devices.
The four port, snap acting relay converts a proportional air pressure change from a controller to a positive (two-position) pressure change. It can also divert a supply line to one of two branches. Replacement device is available for Johnson, Powers, Robertshaw, Barber-Colman, and older Honeywell devices.
Pneumatic switching relays block, divert, or bleed pneumatic air lines when pilot pressure is changed from one specific value to another. Commonly applied in Day-Night, Summer-Winter, Start-Stop, On-Off-Auto and other multiple condition systems where control sequence is changed as conditions change. Replacement devices are available for...
Electronic-Pneumatic Transducers are used in electronic pneumatic control systems to convert a proportional electric output signal from a controller into a direct-acting, proportional pneumatic signal.
Electronic-Pneumatic Transducers are used in electronic pneumatic control systems to convert a proportional electric output signal from a controller into a direct-acting, proportional pneumatic signal.
A diaphragm logic pressure selector selects the highest and/or lowest branch pressure input from zone thermostats to operate final control elements in pneumatic control applications. Replacement devices are available for Johnson, Powers, Robertshaw, and Barber-Colman devices.
A three-port pneumatic potentiometer can sum two input pressures, average two input pressures, be an adjustable flow restriction, or be an adjustable pressure supply. Replacement devices are available for Johnson, Powers, Robertshaw, Barber-Colman, and older Honeywell devices.
Direct acting, modulating relay provides increased capacity of the branchline pressure to the final control device. Replacement devices are available for Johnson, Powers, Robertshaw, Barber-Colman, and older Honeywell devices.
A four port non-bleed pneumatic relay which produces a modulating pressure output, proportional in a fixed ratio to pilot input changes. It is used to control pneumatic valve or damper actuators in sequence from a single thermostat. Replacement devices are available for Johnson, Powers, Robertshaw, Barber-Colman, and older Honeywell devices.
A modulating relay suitable for all types of heating and air conditioning control systems to reverse and increase the capacity of the branchline pressure to the final control element. The output varies inversely with the input with an adjustable offset. Replacement devices are available for Johnson, Powers, Robertshaw, Barber-Colman, and older...
A three-port relay used in HVAC systems averages the signals from two thermostats to control a single device such as a heating coil valve for a multizone unit. The pneumatic averaging relay provides an output pressure equal to the average of two input pressures. Replacement devices are available for Johnson, Powers, Robertshaw, Barber-Colman,...
A three-port hesitation relay provides minimum outside air damper position plus controlled ventilation for large volume unit ventilators. Replacement devices are available for Johnson, Powers, and Barber-Colman devices.
The S-224 Pneumatic Gradual Switch provides manual selection of the pressure in air lines from a remote location. The S-224 is a proportional action relay type switch, which will maintain a selected output pressure setting until it is readjusted. Refer to S-224 Pneumatic Gradual Switch Product Bulletin (LIT-7171370P) and S-224 Gradual Switch...
The S510 gradual switch is designed to allow manual setting of a desired pressure, up to main air pressure, where the application requires remote positioning of final control devices or remote control point adjustment of a pressure signal is desired. The S511-5 and S-511-10 have been designed with an internal high pressure selector relay,...
The S515 pressure regulator allows the manual setting of any desired air pressure, up to main pressure, where the application requires remote positioning of final control devices, remote control point adjustment of receiver controllers, or any other application where manual setting of an output pressure is desired.
These switches are manually operated devices adaptable to a wide variety of applications in pneumatic control systems. They are normally used to perform diverting or supply and exhaust functions to operate final control components or index relays in multiple switching systems. The S520 is a two-position, four-branch switch. The S521 is a two-...
Used to manually position a remote damper actuator or to reset the setpoint of a pneumatic controller. They can also provide minimum damper position by setting a minimum pressure limit in the branch line to the damper actuator. Replacement kits are available for Johnson, Powers, Robertshaw, Barber-Colman, and older Honeywell switches.
The VEC-1010/1020 series are two-position three-way solenoid air valves used to interface between electric and pneumatic circuits. With a lightweight valve body molded of high strength Celcon, these E-P relays are provided with barbed connections for 1/4 polyethylene tubing at all 3 air ports. Typical applications include switching branch or...
This series of YMC switches consists of manually actuated gradual switches and selector switches. Models depicted in photograph are shown with various scale plates.
The YMC-1001 is designed for delivering a variable, selected air pressure from the branch line to a remote device. It is used in pneumatic control circuits for remotely...