Hydraulics & Pneumatics January/February 2022

HYDRAULICS 22 HYDRAULICS & PNEUMATICS January/February 2022 www.hpmag.co.uk A new positive displacement axial piston pump which offers outstanding performance in high-pressure, high- temperature applications has been introduced by Precision Micro-hydraulic specialist, The Lee Company. The HPHT family of pumps can generate up to 10,000 psid (690 bar) at temperatures of 400degF (200degC) so are claimed by the company to be ideal for critical hydraulic fluids transfer applications such as down hole oil tools and aerospace. An important benefit of the innovative axial piston design of these pumps is that they don’t contain any elastomers, which increases resistance to contamination and significantly improves reliability in the most challenging applications. Also, the 32mm pump is a simple, drop-in replacement for existing pumps which are restricted to lower temperature applications due to the inclusion of elastomeric seals. Able to withstand high levels of shock and vibration While HTHP pumps are officially rated to produce pressures of 10,000psi. The Lee Company states they have the capability of producing even higher pressures and are qualified for over 1000 hours of operation and will withstand high levels of shock and vibration. They are designed to be driven by a Maxon Motor, with or without a gearbox and drive couplings are available separately. The pumps are available in 22mm and 30mm diameter options for packaging flexibility, benefits which will be especially appreciated in limited space applications, such as down hole. Cylindrical Hi-Bar inlet screens which slide onto the pump body are also available as an option. The pumps can be customised to meet specific application requirements, such as altering the mounting configuration, or the inlet and outlet connections. www.leeproducts.co.uk Pumps for high-pressure, high-temperature applications Internal gear pumps handle tough abrasives A new range of internal gear pumps, claimed to be ideally suited to applications involving asphalt and bitumen, has been added to the Viking Universal Series of pumps available from the UK pump specialist Michael Smith Engineers. Viking Pump has continually developed its range of Universal Seal Internal Gear pumps and the new ASP series is another example of an upgraded option suitable for handling the toughest abrasives. When pumping asphalt, bitumen and other similar abrasives, pumps have traditionally been sealed with packing which must continually leak to stay lubricated. These two new options, the ASP1 and ASP2 are supplied with Viking’s innovative O-Pro Cartridge seal which uses O-rings in combination with a lubricating grease. This is claimed to ensure a robust seal that improves operational efficiency as it doesn’t need periodic repacking or re-tensioning of the seal gland which eliminates the risk of leaks and prevents loss of product and the associated clean-up costs. Both options are designed specifically for handling asphalts, bitumen, pitch, tar, bunker and residual oils and other similar materials that solidify at ambient temperatures. They are designed to melt