Materials are suitable for your specific application
The bellows, or shell of the jack, is normally manufactured from low carbon steel. However, for applications in a corrosive environment, or where extended active use in conditions of high humidity or spray is desired, the shell of the jack may be manufactured from stainless steel, Monel, or various copper alloys, as may suit the particular application.
The bearing plates are usually manufactured from mild steel, but may be provided in a variety of metallic or polymeric materials to meet specific applications. Polymeric materials are often utilized to minimize weight of assembled jacks in the larger sizes. The bearing plates are usually shipped as loose items, but may be permanently bonded to the shell of the jack if desired. Bonded bearing plates are employed if the jack will be utilized in any position other than horizontal, or if the jack is to be used as a load cell.
Injection and vent ports are stainless steel tubing, and are configured and outfitted with valving, gauges, and other fittings to suit a particular application.
Quality Control
Plate Jacks undergo meticulous inspection throughout their manufacturing process. Before packaging for delivery, each jack undergoes a proof test to ensure it can withstand 120% of its rated pressure. A unique identifier is also tagged on each jack, facilitating traceability to production and test lot numbers.
Plate Jacks offer a consistent thrust for a given pressure throughout their entire expansion range. The relationship between thrust, pressure, and expansion is linear, and this linear relationship applies to all jacks. Jacks intended for use as pressure or load cells undergo individual calibration against electronic devices with NIST traceable calibrations. Additionally, Plate Jacks provide comprehensive injection systems suitable for oil, water, epoxy, or cementitious grout injection. These systems include digital or analog pressure monitoring and recording devices.