Monday, April 15, 2019

Kinetrol Solves Scotch Yoke Actuator Reliability Issues on Top Entry Ball Valves


A southeastern chemical company had reliability issues with the leading brand of scotch yoke actuators. The actuators were mounted on 12" top entry ball valves that sent process reactor off-gas to a dryer for processing. The actuators cycle the valves every two minutes.

Top entry ball valve automation is challenging because the adjustable ball stops on top entry ball valves can increase torque values, and undersized actuators are common. In this application, the scotch yoke actuators were also unreliable due to seal leaks, sticking, and lock up, which dramatically affected the plants production of PTA (purified terephthalic acid).

The first Kinetrol actuator installation for this application, a 187-100, was installed at the chemical plant 1997, and it is still in service today. By our calculations, that actuator has cycled 5,148,000 since then, considering it strokes every two minutes, 24 hours a day, 7 days a week for 325 days a year.

For more information, contact Kinetrol USA.
https://kinetrolusa.com
972-447-9443

Thursday, March 28, 2019

Upgrade in Steam Balancing Valve Actuators at Combined-cycle Power Plant Lead to Kinetrol

The customer for this application note is an electrical power station with a combined-cycle, natural gas-fired generating unit with two combustion turbines, two heat recovery steam generators and one steam turbine. The output of combustion turbines can vary at different times throughout the year. The nominal output for this facility is 577 megawatts. The station burns natural gas.

A combined-cycle power plant uses a gas and a steam turbine together to produce up to 50% more generated electricity, using the same fuel, when compared to a traditional simple-cycle plant. The gas turbine waste heat is routed to the nearby steam turbine which, in turn, generates the extra power.

One of the most common components for managing high-pressure steam in a combined-cycle plant is the HRH bypass valve (HRH stands for "hot reheat"). Since the valve actuator controls the valve’s ability to reliably and accurately respond to system demands, it can be argued it is one of the most important elements in the steam bypass system, and therefore the entire combined-cycle plant.

In this application, the customer had two 18" steam balancing valves using large, high torque, scotch-yoke actuators that had to cycle 20 times a day. These actuators presented significant performance issues (they were failing), plus they were very large which presented maintenance difficulties.

The customer approached the local Kinetrol USA Distributor and inquired if they could suggest a better alternative. The goal was to provide replacement actuators that provide very high torque, be highly reliable, and save space.

The Distributor recommended Kinetrol Model 30 pneumatic rotary actuators. The Model 30 provides 168000 lbf ins (19140 Nm) at 100 psi (7 bar) of torque and were significantly smaller and lighter than the legacy scotch-yoke actuators. Most importantly, they carried the world-renowned Kinetrol reputation for outstanding reliability, long life, and maintenance-free operation.

Kinetrol USA
https://kinetrolusa.com
972-447-9443

Tuesday, February 26, 2019

Trouble-free Pneumatic Valve and Damper Actuators


A rugged, corrosion-resistant pneumatic vane actuator with only a single moving part, the Kinetrol vane actuator is warranted to operate trouble-free for millions of cycles.

With millions of actuators performing reliably around the world, the Kinetrol vane actuator's outstanding cycle life, smooth and precise movement, and environmentally rugged design makes it the best choice for all of your automated valve requirements.

Kinetrol USA
https://kinetrolusa.com
972-447-9443

Tuesday, February 19, 2019

Proven Dependability: Kinetrol Vane Actuators

Kinetrol actuators provide years of reliable and dependable performance in the toughest environments and application. When you plan your next valve automation requirement, choose Kinetrol vane actuators.

Kinetrol USA
https://kinetrolusa.com
972-447-9443


Monday, January 21, 2019

Demonstration of NAMUR Mount Solenoid Valve with Manual Bypass Option on Kinetrol Actuator

This video demonstrates a very helpful solenoid valve option, the manual bypass feature. The technician uses a NAMUR mounted solenoid valve with built-in bypass on a Kinetrol vane actuator to show you exactly how the option works.

Thursday, January 10, 2019

How to Install the Optional 4-20 mA Feedback Mechanism on the the Kinetrol AP Pneumatic Positioner


This video describes how to install the optional angle retransmit circuit  (4-20 mA feedback mechanism) on the Kinetrol AP pneumatic positioner.

The angle retransmit circuit is an externally powered (8–30v DC) linear 4-20mA feedback module, rangeable down to 30 deg. for full 4-20mA span. The module's retransmit pot is a high quality conductive plastic servo–type with ball bearings, coupled with a zero-backlash feedback pot drive. The combination provides long life and high precision.

The Kinetrol AP positioner moves an actuator to a position set by a 3-15 psi control signal and holds it there. It is designed to drive a rotary or linear actuator to a position set by a 3-15 psi (0.2 to 1.0 bar) signal and hold it there until the signal changes.

For more information, contact Kinetrol USA by calling 972-447-9443 or visiting https://kinetrolusa.com.

Wednesday, January 9, 2019

How to Install the Kinetrol AP Pneumatic Positioner


This video describes how to install a Kinetrol AP pneumatic positioner on a Kinetrol vane actuator.

The Kinetrol AP positioner moves an actuator to a position set by a 3-15 psi control signal and holds it there. It is designed to drive a rotary or linear actuator to a position set by a 3-15 psi (0.2 to 1.0 bar) signal and hold it there until the signal changes.

When a signal pressure is applied to the diaphragm it moves the force balance lever clockwise against the tension of the feedback spring. This moves the spool valve, supplying air pressure to one side of the actuator while exhausting trapped air from the other side.

The feedback shaft follows the movement of the actuator and turns the cam counter clockwise, pushing the cam follower and increasing the tension on the feedback spring until it balances the forces on the diaphragm and moves the spool valve to its hold position.

The input signal and desired position is determined by the cam profile. A cam giving 0-90° output movement linearly proportional to a 3-15 psi (0.2-1.0 bar) signal is standard, and almost any desired characteristic can be supplied to order; if it cannot be found in the list of existing options contact Kinetrol.

For more information, contact Kinetrol USA by calling 972-447-9443 or visiting https://kinetrolusa.com.