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Mechanism for opening and closing a valve
Electric actuator (blue cylinder) on a valve in a power plant. A black handwheel is visible on the actuator, which allows manual positioning of the valve. The blue valve body is visible in-line with the pipe. The valve actuator opens or closes the butterfly disc of the valve based on electrical signals sent to the actuator. Another valve actuator is visible in the background, with windows to indicate the valve position.
A valve actuator is the mechanism for opening and closing a valve. Manually operated valves require someone in attendance to adjust them using a direct or geared mechanism attached to the valve stem. Power-operated actuators, using gas pressure, hydraulic pressure or electricity, allow a valve to be adjusted remotely, or allow rapid operation of large valves. Power-operated valve actuators may be the final elements of an automatic control loop which automatically regulates some flow, level or other process. Actuators may be only to open and close the valve, or may allow intermediate positioning; some valve actuators include switches or other ways to remotely indicate the position of the valve.
Used for the automation of industrial valves, actuators can be found in all kinds of process plants. They are used in waste water treatment plants, power plants, refineries, mining and nuclear processes, food factories, and pipelines. Valve actuators play a major part in automating process control. The valves to be automated vary both in design and dimension. The diameters of the valves range from one-tenth of an inch to several feet.
A valveactuator is the mechanism for opening and closing a valve. Manually operated valves require someone in attendance to adjust them using a direct...
or hydraulic input is supplied to it in a system (called an actuating system). An actuator converts such an input signal into the required form of mechanical...
The motion can be rotary or linear, depending on the type of actuator. A pneumatic actuator mainly consists of a piston or a diaphragm which develops the...
therefore compromises are necessary. An engine equipped with a variable valve timing actuation system is freed from this constraint, allowing performance to be...
output pressure to the actuator through a pneumatic amplifier relay. The increased output pressure to the actuator causes the valve stem to move. Stem movement...
An idle air control actuator or idle air control valve (IAC actuator/valve) is a device commonly used in fuel-injected vehicles to control the engine's...
of actuator turns out to be inefficient, hence the ARIS type of valveactuator which is widely used in the industry and provides effective valve-operating...
as when the valve is very large. Pneumatic actuators and hydraulic actuators need pressurised air or liquid lines to supply the actuator: an inlet line...
connector from the actuator to the inside of the valve and transmits this actuation force. Stems are either smooth for actuator controlled valves or threaded...
different controls for their actuation in different directions. A desmodromic valve is a reciprocating engine poppet valve that is positively closed by...
An overhead valve (OHV) engine, sometimes called a pushrod engine, is a piston engine whose valves are located in the cylinder head above the combustion...
A rotary actuator is an actuator that produces a rotary motion or torque. The simplest actuator is purely mechanical, where linear motion in one direction...
varies from linear action, plunger-type actuators to pivoted-armature actuators and rocker actuators. The valve can use a two-port design to regulate a...
electronically actuated oil spool valve, which sends oil pressure to the lifter actuators, which then move the engagement pins into place above the valve stem,...
blowoff valve (also called dump valve or compressor bypass valve) is a pressure release system present in most petrol turbocharged engines. Blowoff valves are...
A linear actuator is an actuator that creates linear motion (i.e., in a straight line), in contrast to the circular motion of a conventional electric...
A shutdown valve (also referred to as SDV or emergency shutdown valve, ESV, ESD, or ESDV; or safety shutoff valve) is an actuatedvalve designed to stop...
the area of mechanical actuation Variable valveactuation, any mechanism or method that can alter the shape or timing of a valve lift event within an internal...
System for ValveActuator US 10,119,435, Combustion Engine and Mantle Assembly Therefore US 10,184,361, Combustion Engine with Pneumatic Valve Return Spring...
to an actuator on the outside of the valve. Rotating the actuator turns the disc either parallel or perpendicular to the flow. Unlike a ball valve, the...
devices where a device is inserted into the valve and actuator assembly that physically prevents the valve from moving past a certain point. These are...
heating circuits or sewer pipes. Common gate valves are actuated by a threaded stem that connects the actuator (e.g. handwheel or motor) to the gate. They...
the valveactuator or, more commonly, a pneumatic positioner. The positioner is a dedicated controller which has a mechanical linkage to the actuator movement...
static level of force, controlling the valve effectively, without any attendant peak lift load increase. The actuation mechanism is simply a piston and cylinder...
electrohydraulic servo valve (EHSV) is an electrically-operated valve that controls how hydraulic fluid is sent to an actuator. Servo valves are often used to...
changing road or dynamic conditions, active suspensions use some type of actuator to raise and lower the chassis independently at each wheel. These technologies...
diaphragm valves use pneumatic actuators; in this type of valve, air pressure is applied through a pilot valve into the actuator which in turn raises the diaphragm...
engineers, develops and manufacturers commercial vehicle retarding and valveactuation technologies. The company produces light-duty, medium-duty, and heavy-duty...
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