RHK designs and manufactures a wide array of hydraulic cylinders. A welded design cylinder is popular for both its durability and serviceability.
RHK’s technical sales and engineering teams have extensive experience designing cylinders from a set of specifications or even a conceptual idea.
RHK is a leader in custom manufacturing of all types of hydraulic cylinders. We manufacture single or multi-stage cylinders, single or double acting. All products are engineered to meet safety, material strength, and load capacity guidelines. Additionally, all manufacturing processes are done in-house.
Our engineering and applications team will work closely with you, the customer to understand your specifications, requirements and applications. RHK will create designs, manufacture, inspect and deliver within the timeframe which ensures consistent high-quality cylinders to the marketplace. All cylinders are designed, built and tested as per API standards and follow ISO 9001:2015 standards.
RHK’s versatile manufacturing process accommodates low and high volume orders of varying sized cylinders. Every component is rigorously measured, tested and held to RHK’s Quality Assurance program. Using ERP software progress is monitored ensuring every order is fulfilled accurately and on time.
Once assembled and tested, completed cylinders are primed light grey for rust protection while in transport. Full painting services are also available.
Use this sheet to help design a custom cylinder and obtain a quote. Not all specs are required but the more information provided, the better.
Here is a list of typical mounting connections. For custom mounting options, get in touch!
Cross Tube
Flange – Round
Clevis
Flange – Square
Clevis – Threaded
Hole Thru
Lug
Threaded – Male
Lug w/Spherical
Plane Bearing
Threaded – Female
Trunnion
Radius
Tie-rods and welded cylinders are both used in fluid power systems, however, each has its own advantages. Welded cylinders are welded to the barrel, making it permanent and higher durability. The end caps of tie-rods are held together by four threaded tie bolts that run throughout the cylinder. While this makes it easier to change out with a standard wrench, high pressure and extended use will cause the tie-rods to stretch out.
Every cylinder must be tested every 5 or 10 years as required by The Department of Transportation (DOT) and Pipeline and Hazardous Materials Safety Administration (PHMSA) before it can be filled.
The most common causes of welded cylinder failure are:
Since the ends are welded, it is difficult but not impossible. The rod seals and assembly of piston rods can be removed for service. The cylinder can be removed from service, stripped, cleaned, and reassembled.
Since 1990, RHK has been manufacturing hydraulic cylinders for a wide range of industries. Our Sales and Engineering team has extensive experience and is standing by to develop a custom solution for your application.
