Chemical industry valves, chemical industry pumps from BDK Group India


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ACTUATORS

WHAT IS AN ACTUATOR

ac·tu·a·tor
One that activates, especially a device responsible for actuating a mechanical equipment, such as one connected to a computer by a sensor link.

Alternatively

A mechanism that causes a device to be turned on or off, adjusted or moved. The motor and mechanism that moves the head assembly on a disk drive or an arm of a robot is called an actuator.
Actuators are used for the automation of industrial valves found in all kinds of technical process plants including wastewater treatment plants, power plants, refineries etc wherein they play a major role in automation process. The valves to be automated vary both in design and dimensions. The diameters of the valves range from a few inches to a few meters. Depending on their type of source for operation, the actuators may be classified as pneumatic, hydraulic and electric actuators.

TYPES OF ACTUATORS

Quarter-turn actuators
Quarter-turn actuators are required for the automation of quarter-turn valves. Major representatives of this type are butterfly valves and ball valves. A quarter-turn actuator is a device which transmits the torque to the valve for quarter-turn (90 Deg.) operation. Since these actuators are coupled with quarter-turn gear box, they need not be capable of withstanding thrust generated by the valve.

BDK - B TORQ SECTIONAL VIEW

APPLICATION

B Torq is a pneumatic quarter turn actuator with rack and pinion design to actuate any quarter turn valve such as:

Butterfly valves
Ball valves
Plug valves

Media : Instrument Air / Nitrogen
Air pressure range : 2 bar to 10 bar

DESIGN FEATURES

Reliability:- we have conducted cyclic testing for over 100,000 cycles without any breakdowns. Certification available upon request.

Compact and Designed for high performance:- compared to most other actuators B-Torq is extremely compact, without compromising on its torque features thereby making it easy to mount, dismount and handle.

Low friction bearings for long cycle life:- B-Torq actuators under test conditions have proved to be far longer lasting than its competitors thereby giving you a quick Return on Investment and longer equipment life.

Heavy duty Aluminum hard anodized body for high corrosion protection:- Warranty covers 18 months of corrosion protection even in the harshest conditions.

Twin Rack Aluminum die cast hard anodized Pistons:- Providing superior functioning and greater life.

High precision Nickel Alloy Steel Pinion:- Virtually unbreakable ensuring a smooth maintenance free operation.

Aluminum die cast end caps powder coated:- Most manufacturers use non painted end caps which may rust.

Namur mounting for direct interface with solenoid valves:- For easy operation and compatibility.

+ or –4 deg travel adjustment:- Allows field adjustment for the valve settings with ease without the need to dismount the valves from the line.

Lesser numbers of O rings for trouble free operation:- Lesser number of O rings equals lesser number of parts to replace due to wear and tear.

Wider spring combinations with guide pin:- Gives the ability for greater selection options, wider torque range and economical solutions.

FUNCTIONAL FEATURES

Quick and easy operation:- B-Torq is quick to mount and extremely user friendly to operate, no need for extensive manuals or training is required to set up a B-Torq Actuator.

Lower Air consumption:- B-Torq has proven to be the most economical actuator in it’s class with the lowest air consumption required to open and close the actuator, this in turn gives the customers the fastest ROI possible.

Operates at very low air pressures; as low as 2 bar:- As mentioned B-Torq can operate at air pressures as low as 2 bar, most other actuators need much higher air pressures for the same class actuator.

Tested for 1 Million cycles:- B-Torq has been tested for a million cycles rigorously and has successfully surpassed this mark without a single operational hitch thereby proving its quality and durability

Higher torque range:- B-Torq has the widest range of models available for selection, this large range allows customers to choose the perfect model based on the service conditions thereby eliminating the chances of an oversized or an undersized actuator.

Variety of Models for economical selection:- B-Torq is an extremely competitive product and can help save customers over 30% in operational, maintenance and efficiency costs over the nearest competitors.

Star drive connection for multiple shaft adaptations and different degree of mounting:- B-Torq is a versatile product that gives customers a wide range of multiple shaft adaptations and eliminates restrictions during selection and installations.

MATERIAL CONSTRUCTION

Body	: Extruded hard anodized Aluminum
Pistons	: Die cast hard anodized Aluminum / Steel
Pinion	: Nickel Alloy Steel
End caps	: Die cast Aluminum powder coated
Springs	: Spring Steel
O Rings	: NBR/Viton
Bearings	: Low friction Delrin (Poly Acetyl)
Screws	: Stainless Steel

Please click on the links below, to know more about Types of Actuators

	SINGLE ACTING
	DOUBLE ACTING

HOW TO SELECT AN ACTUATOR
Pneumatic actuator sizing is very important for the pneumatic application. Pneumatic engineers need to look at the push and pull forces being applied to the pneumatic actuators. Rod size, sliding loading and bending moments will lead to the actuator buckling. Cushions should be considered for the maximum deceleration when using actuators. Cushion capabilities for pneumatic actuator designers, have many variables to examine. One must always consider the compressibility of the gas, weight, velocity friction pressure and of course the load. If cushioning is not applied properly the following major issues will occur: the piston could impact the end cap, oscillating, movement in the opposite direction and stopping in place are just a few examples. Finally, if cushion issues of bouncing keep occurring, one should consider making adjustments to both the cushions and/ or loading when designing the pneumatic circuit. Examples of possible solutions are meter-out, or meter-in and external shock absorber being used.

HOW TO SELECT AN ACTUATOR - WORKING EXAMPLE

Examples, for pneumatic actuators a 3.5-inches actuator is being used to give a force output of 500-lbs.What is the pressure required?P-(pressure Psi) = F-(force lbs) / area-(in2) Therefore;
3.5 x 3.5 x.7854 = 9.62-in2, 500-lbs / 9.62-in2 = 51.97-Psior 52-Psi needed to overcome the cylinder.
What is the total volume of the actuator if the cylinder with a bore of 3.5-inches and a Stroke of 10-inches
9.62-in2 x 10-inches stroke = 96.2-in3 of volume.