Showing posts with label industrial valve. Show all posts
Showing posts with label industrial valve. Show all posts

Tuesday, August 28, 2018

What Are Cryogenic Ball Valves?

Cryogenic Ball Valve
Cryogenic Ball Valve (Flowserve Worcester)
Cryogenic ball valves are high-performance shutoff valves for intermittent and continuous flow applications with temperatures to -425°F. They are used on tough applications involving all types of cryogens, such as oxygen, hydrogen, methane, ammonia, nitrogen, fluorine, LNG and deuterium.

Cryogenic ball valves include unique features to ensure safety and performance in cryogenic applications. Central to the cryogenic design is a rugged, one-piece, pressure safe stem with a Polyfill thrust bearing and stainless steel split ring. It provides design safety and low operational torque. Polyfill seats give you tight shutoff throughout the temperature range. With an orientation-controlled stem/ball connection and an upstream hole in the ball, you get positive overpressure protection.

Summary of specialized design features:
Brass Cryogenic Ball Valve
Brass Cryogenic Ball Valve
(Flowserve Worcester)
  • Positive Ball Cavity Relief – An upstream relief hole in the ball prevents dangerous overpressure due to thermal expansion. On extended stem valves through 2", a one-piece stem with alignment pin assures proper orientation of the ball.
  • Pressure Safe Stem – Both one-piece and two-piece, assembled inside-the-body stems are safe from blowout and are supported with Polyfill® thrust washers.
  • Zero Leak Packing – Belleville live-loaded TFE packing rings and stem centering followers assure zero leakage through the toughest, high-cycle applications.
  • Effective Bonnet Extensions – The stem extensions of cryogenic valves conform to standard industrial practices. That means wall thickness and lengths that keep heat transfer down, the packing frost-free, operational torques low, and actuators solidly supported.
  • High-Performance/Low-Thermal Stress – The special “part compatibility” design of valve parts, Polyfill seats and body seals assure tight shutoff, zero body leakage and low torque through large thermal excursions from ambient to -425°F.
Cryogenic valves are normally available in four body configuration, in either stainless steel or brass:
  1. Three-piece construction - makes it easy to install, versatile in application and simple to maintain.
  2. The cryogenic diverter valve - accepts media through the bottom inlet port and directs it to one of two side ports.
  3. The wafer design - a flangeless cryogenic valve that mounts between ANSI Class 150 or 300 flanges.
  4. A flanged design - has a body cast with ANSI Class 150 flanges.
Application for cryogenic ball valves:
  • Over-the-Road LNG-LPG Trailers
  • Terminal Unloading Stations
  • High-Purity Cryogenic/Gas Systems
  • LNG Storage and Distribution
  • CO2 and Nitrogen Injection for Enhanced Oil Recovery
  • Over-the-Road CO2, LNG, Food Carriers
  • Petroleum Refining Unleaded Gasoline (Gas Treatment Skids)
  • Lyophilization Systems
  • Air Separation Plants
  • Liquid and Gaseous Oxygen
  • Inerting and Heat Treatment
For more information on cryogenic ball valves, contact Swanson Flo by visiting https://swansonflo.com or by calling 800-288-7926.

Thursday, August 31, 2017

Understanding Industrial Rack and Pinion Valve Actuators

Basic concept of rack and pinion gear
Basic concept of
rack and pinion gear.
Valves are essential to industries which constitute the backbone of the modern world. The prevalence of valves in engineering, mechanics, and science demands that each individual valve performs to a certain standard. Just as the valve itself is a key component of a larger system, the valve actuator is as important to the valve as the valve is to the industry in which it functions. Actuators are powered mechanisms that position valves between open and closed states.

Pneumatic rack and pinion actuators utilize air pressure as the motive force which changes the position of a valve.  A rack and pinion actuator is comprised of two opposing pistons, each with its own gear (referred to as the "rack"). The two piston racks are set against a round pinion gear. As pressure increases against one side of each piston, each rack moves linearly against the opposite sides of the pinion gear causing rotational movement. This rotational movement is used to open and close a valve. See the animation above (provided by Wikipedia) below for a visual understanding.

This short video introduces the basic parts and operation of rack and pinion valve actuators to anyone unfamiliar with the device.


Visit http://www.swansonflo.com to learn more about industrial valves, valve actuators, and valve automation.