Bray Series 70 Electric Actuator
What is the Bray S70? Electric Quarter Turn Valve Actuator Physically fits small to midsize valves Three Housing Sizes Ten Torque Ratings
S70 Electric Actuator Sizes Housing Size 0006 0012 0030 300 lb-in 800 lb-in 3,000 lb-in 500 lb-in 1,200 lb-in 5,000 lb-in 2,000 lb-in 6,500 lb-in 13,000 lb-in 18,000 lb-in
S70 Electric Actuator Where Does It Fit In? Technical Superiority Fourth generation product Long Term Growth Electric products are becoming more dominant Fieldbus, ProfiBus, DeviceNet
S70 Electric Actuator External Components Housing (Base and Cover) Travel Stops Manual Override Position Indicator
S70 Electric Actuator Housing Die-cast Aluminum High quality polyester powder coating Round Shape Distinctively Different! High technology appearance Extremely low profile Especially when mounted on Bray valves, which require no brackets
S70 Electric Actuator Weatherproof Enclosure Round sealing groove O-Ring does not distort from natural shape Circumferential lip on cover Captive cover bolts Bolts placed outside sealing area
Typical Gasket Seal Housing pushes gasket down No metal to metal contact Squeeze is uncontrolled Can over compress or extrude Not retained in groove Alignment with bolts difficult
Typical O-Ring Seal Housing pushes O-ring up Metal to metal contact Squeeze is controlled Seals against only one surface Difficult to retain in groove
S70 Electric Actuator Seal Housing pushes O-ring down and in Metal to metal contact Squeeze is controlled Seals against two surfaces Easy to retain in position
Mechanical travel stop bolts Adjustable with cover installed S70 Electric Actuator Normally set for 0 and 90 travel Travel Stops
S70 Electric Actuator Manual Override Handwheel Driven Pull to Engage Override Electrical Safety Switch interrupts power to the motor Yellow Stripe around handwheel hub indicates Manual Override is engaged
Bray Note The Manual Override Handwheel can be pulled to Emergency Stop the S70 Electric Actuator
S70 Electric Actuator Position Indicator Highly Visible Status Display Prominently labeled & color coded Displays valve position through full range of travel High impact, heat & chemical resistant clear No protrusion through enclosure No potential leak path
S70 Electric Actuator Internal Components Motor (and Capacitor for AC Units) Includes Spur Gear Train Worm Gear and Output Drive Switchplate, Switches, Wiring Heater Servo Pro
S70 Electric Actuator General Layout Components requiring user access are widely spaced on top of switchplate for convenience Components not requiring user access are placed underneath the switchplate for protection
S70 Electric Actuator Power Center (Below the Switchplate) Motor Capacitor Spur Gears Worm Gear Output Drive Torque Springs
S70 Electric Actuator Motor PSC Fractional Horsepower Single Phase AC Motor PSC = Permanent Split Capacitor No brushes to wear out No sparking Internal Thermal Overload Protection Protects Motor from overheating damage
Rule of Thumb PSC Fractional Horsepower Single Phase AC motors are used in small to midsize electric valve actuators. Integral Horsepower Three Phase AC motors are used in large electric valve actuators.
S70 Electric Actuator Motor DC Motor also available 30VDC motor. Can supply up to 5000 lb-in torque Internal Thermal Overload Protection Protects Motor from overheating damage
S70 Electric Actuator Speeds @ 60 Hz (seconds for 1/4 turn) Size 300 30, 15, 8 Size 500 30, 15 Size 800 30, 15, 10, 6 Size 1200 30, 15, 10 Size 2000 30, 15 Size 3000 30, 18 Size 5000 30, 18 Size 6500 30 Size 13000 90 Size 18000 125
Rule of Thumb Electric Valve Actuators can generate more torque if the speed of travel is reduced, so high torque units tend to be slow.
Bray Note S70 AC motors will operate on either 50 or 60 Hz single phase power, but they run slower on 50 Hz 30 secs @ 60 Hz = 36 secs @ 50 Hz 15 secs @ 60 Hz = 18 secs @ 50 Hz
S70 Electric Actuator Motor Duty Cycle Intermittent Duty: 25% 6, 8, 10, 15 & 18 second speeds Continuous Duty: 100% 30 second and longer speeds Ambient Temperature of 104 F (40 C)
S70 Electric Actuator Spur Gear Train Trades speed for torque High speed, low torque Motor produces low speed, high torque output Gears permanently attached to motor Commonly called a Gear Motor Bray Custom Design Strength, efficiency and packaging
S70 Electric Actuator Output Drive Final Stage is a Worm & Segment Gear Similar to a Manual Gearbox Actuator Steel Worm Bronze Output Gear Segment Locks Actuator in Position when Electric Power is off Eliminates requirement for Motor Brake
S70 Electric Actuator Control Center (Above the Switchplate) Wiring terminals Travel Switches and Cams Position Indicator Optional Torque Switches Optional Servo Pro Optional Feedback Potentiometer
S70 Electric Actuator Two Conduit Entries Field Wiring One for power, one for control UNC or Metric Threads available Surface for Optional Control Box Local /Remote Control Switch Local Indicator Lights
Bray Note If only one S70 conduit entry is used for field wiring, the unused conduit entry must be filled with a weatherproof plug.
S70 Electric Actuator SPDT Travel Limit Switches Two mechanically isolated and electrically independent SPDT switches. Can be used with AC motor and DC control lamps. Simultaneous actuation with one cam SPDT is also called Form C
General-Purpose Topology Form A and Form B switches are single pole single throw (SPST) switch types. The differentiation is in the rest state. In this state, Form A switches are open. Form B switches are closed when at rest. Form C and Form D switches are single pole double throw (SPDT) switch. Form C switch opens the connection before it closes the other connection (this is also known as break before make or BBM). The Form D switch closes both connections before opening the original connection (this is also known as make before break or MBB).
General-Purpose Topology
Rule of Thumb Electrical Travel Switches should be set to activate before Mechanical Travel Stops Mechanical Travel Stops stop the handwheel Electrical Travel Switches stop the motor
S70 Electric Actuator Options Torque Switches Actuator can immediately reverse Process remains controlled Heater Anti-condensation protection for wiring Only works with power applied Servo Electronic Positioner
S70 Electric Actuator Options Potentiometer Position Feedback Control Box Local-Off-Remote Switch Open-Stop-Close Switch Open & Close Lights
S70 Electric Actuator Torque Switches Output torque is mechanically sensed Torque switches open at preset torque to protect the motor Presets are made at the factory Number and size of torque springs Screw adjustment
Bray Note The S70 Electric Actuator has optional torque switches while competitive actuators either have them standard, or do not have them at all
S70 Electric Actuator Optional Torque Switch Advantage If the customer requires torque switches, you can supply them Competition without torque switches is eliminated If the customer does not require torque switches, you can leave them out Competition with torque switches is overpriced
Rule of Thumb Torque Switches protect the Gear Train Thermal Overloads protect the Motor
Reality Check S70 Actuators can be successfully supplied without Torque Switches Gear Train is designed to be strong enough to withstand the full Motor Torque Motor is protected by a Thermal Overload Switch
S70 Electric Actuator Heater Self-Regulating Temperature controlled Located in power center but can be mounted without removal of top-plate Anti-condensation protection for wiring Only works with power applied
S70 Electric Actuator Servo Pro 110VAC, 220VAC, 24 VAC and DeviceNet Versions Precise modulating control Built-in multiple input control signal capability - Field configurable 4-20 madc, 0-10 VDC, 0-5 VDC, 2-10 VDC Approach circuit to prevent overshooting setpoint
S70 Electric Actuator Valve position feedback Potentiometer Used independently or with Servo Calibration done through unique gear arrangement and easily accessible with no special tools Simple adjustment aligns the potentiometer as easy as a travel cam
S70 Electric Actuator Is Really a Group of Products! Basic Actuator like S90 On/Off Control like S60 Switches like S50 Electronic Positioner like S64 and S6A Manual Override like S05
S70 Electric Actuator Cautions When Quoting Single Phase AC Motors (standard) Three Phase AC Motors & DC motors available NEMA 7 housing only in Size 12 2 SPDT Travel Switches are standard Almost all of the time 2 SPDT are OK Auxiliary Switches are optional and depending on the unit configuration you could add up to 4 additional switches.
S70 Electric Actuator Red Round Rotary Reliable