Linkage‐Less Non‐Contact Position Feedback — The high performance, linkage-less feedback system, shown in Figure 1, eliminates physical contact between the valve stem and the instrument. There is no wearing of parts so cycle life is maximized. Additionally, the elimination of levers and linkages reduces the number of mounting parts and mounting complexity. Instrument replacement and maintenance is simplified because the feedback parts stay connected to the actuator stem
Built to Survive — The DVC7K's field-proven conformal coated electronics resist the effects of vibration, temperature and corrosive atmospheres per the ISA.75.13 standard. A weather‐tight housing construction protects the wiring terminal box and critical components from harsh environmental conditions
Local User Interface (LUI) — The full text display in the local interface is easy to navigate due to the six button LUI (Figure 2). Each unit can be configured to display Arabic, Chinese, Czech, English, French, German, Italian, Japanese, Korean, Polish, Portuguese, Russian or Spanish. View the Travel vs. Travel Setpoint, Instrument Mode and Valve Health instantly from the home screen.
Accurate and Responsive — The two‐stage instrument design provides quick response. Additionally, the DVC7K allows users to customize the performance of their valve, with a configurable ramp open rate and ramp closed rate.
Enhanced Safety — The DVC7K is a HART® communicating device; information can be accessed anywhere along the loop. This flexibility can reduce exposure to hazardous environments and make it easier to evaluate valves in hard-to-reach locations
Valve Health — Identify the health status of the valve assembly at a distance with the NE 107 LED indicator. Quickly troubleshoot issues and identify recommended actions with Advice at the Device. Additionally, use the LUI to view primary variables like supply pressure and input current
Faster Commissioning — HART communications allow the user to quickly commission loops with a variety of tools from a remote location or locally at the valve assembly with the LUI.
Wireless interface: Future versions will support Emerson's secure Bluetooth® wireless technology for easy viewing of the health of multiple valves.
Specifications
Mounting: Integral mounting to FISHER rotary and sliding-stem actuators，Mounting to Bettis and Emerson rotary, sliding-stem, and isolation actuators.
Communication protocol: Supports the HART 7 communication protocol, allowing configuration and monitoring from a remote location or through a local user interface (LUI).
Input signals: Support point-to-point analog input signals, 4-20 mA DC (nominal), 24V DC (On/Off only).
Supply pressure: Minimum Recommended: 0.3 bar / 5 psig higher than maximum actuator requirements Maximum: 10.0 bar / 145 psig or maximum pressure rating of the actuator, whichever is lower Supply medium must be clean, dry and noncorrosive
Output signal: Pneumatic signal, up to full supply pressure Maximum Span: 9.5 bar / 140 psig Action: Double/Single Direct or Reverse
Operating ambient temperature limits: Standard temperature range is -40 to 80°C (-40 to 176°F).
Electromagnetic compatibility: in accordance with EN 61326-1:2013.
Hazardous Area Approvals: There are a variety of certifications, including cCSAus, IECEx, ATEX, NEPSI, etc., applicable to different countries and regions of the explosion-proof area classification.
Options: ■ Integral mounted filter regulator ■ Low‐Bleed Relay(7) ■ Extreme Temperature ■ High Temperature ■ Integral 4 to 20 mA Position Transmitter(8)(9) ■ Integral Switches(10)(11) ■ Pipe-away Vent Connection
Actuator compatibility: Stem Travel (Sliding‐Stem Linear): Linear actuators with rated travel between 6.35 mm / 0.25 in. and 606 mm / 23.375 in. Shaft Rotation (Quarter‐Turn Rotary): Rotary actuators with rated travel between 45° and 180°
Applications
Industrial applications including but not limited to the oil and gas, chemical, power and water treatment industries.
The following are some of the key application for the DVC7K: Oil & Gas, Chemical, Power, Water Treatment, Food & Beverage, Pharmaceutical, Pulp & Paper, Metals & Mining.
