ESG represents the premier valve automation lines in the industry. We provide our customers with everything from simple on-off packages to throttling applications, high-pressure gas systems, overpressure protection, and emergency shutdown assemblies. Our qualified, technical team will customize your valve automation requirements to your unique product specifications and identify the most efficient solution for your needs.
Electric actuators are typically used in the upstream, midstream, downstream and wastewater applications and use a low or high voltage, electrical input to open or close all types of valves. Electric actuators offer optimum control characteristics and are easily installed on all types of valves.
Fluid Powered Actuators
Fluid powered actuators utilize hydraulic fluid to operate the actuator and can be either self-contained or gas assisted. Fluid power actuators are typically used in upstream and midstream applications in safety-critical situations on very large diameter valves when there is limited or no air supply. A key feature of these valve automation products is that fluid power actuators can have a built-in energy source allowing the valve to be closed completely if power is lost as an added safety measure. In other applications, if a hydraulic power unit is available, the size of the actuator compared to a pneumatic actuator will be downsized by a factor of roughly half.
- High-Pressure Gas Systems
- Rack & Pinion
- Scotch Yoke
- Spring Diaphragm
Manual actuators are commonly used across all industry sectors and are typically utilized on large valves to assist in opening and closing of the valve. Manual actuators are, as their name implies, powered manually by the operator but allow the valve to be opened and closed with much less force than would typically be required. This decrease in the required force creates a safe work environment when operators need to open or close a large diameter valve.
- Spring-Return Handles
- Gear Operators
- Valve Indicators
A limit switch is a valve automation accessory. They can be used with various types of actuators to remotely identify whether a valve is open or closed. The limit switch is mounted on the actuator and communicates electronically with the facility’s process control system. Limit switches can help identify problems in the valve automation system before potentially dangerous and costly accidents occur.
- Proximity Type
Positioners are a valve automation accessory designed to control the position of the valve. Positioners allow the operator to remotely open or close an automated valve by varying degrees using either pneumatic or electrical signal. This accessory is commonly used in all flow control applications but is especially applicable for situations where precise control over the varying degree of fluid that should be allowed through a valve at one time.
ESG offers many networking solutions for our customers’ flow control needs. These networking systems allow the connection of multiple control valves on one loop so that the operator can communicate instructions to an entire chain of automated valves instead of on a point-to-point basis. This process can create significant cost savings during the installation process and allows for increased functionality. Networks of this type are predominantly used in downstream applications, where there are multiple automated valves in a relatively small geographic area.