Valve lapping tool for Grinding of Gate valve and wedges.
Diameter capabilities of grinding 65 – 600mm / 2 1/2”-24” valves, dependent upon model chosen. The machine is available with air or electric drive unit.

Mechanically Driven Technology The LarsLap equipment is a mechanically driven system (G and FL) with all grinding wheels moving at the same rate of speed. This technology produces a perfect crosshatch pattern as the inside and outside of the seat is being ground at the same time and as close to the same cutting speed as possible. The speed is at least five (5) times faster than friction driven systems as a gear (G models) or O-ring (FL Models) is driving each grinding wheel. The driving plate pivots instead of the grinding wheels, which places the pressure in the middle of the driving plate. This results in a perfectly flat seat – without undesirable effects such as concave or convex seats. These results can also be seen when grinding a seat that has become concave or convex due to improper grinding. With the mechanically driven technology the damaged seats can be ground to become flat. The direction of the motor (air or electric) on the LarsLap equipment can be easily reversed.

Versatility Each Complete Model STC – G and FL, of the LarsLap equipment is provided for use on Gate valve and wedges from 65 – 600mm. However, any standard machine can be customized to meet the customer’s specific range of valve dimension. For example, one may start with a modified machine for small valves and expand according to your shop / plant requirements. In cases where valves sizes are above (250kg/550lbs) 300mm (12”) a separate scissor type lifting table is supplied to hold and support the valve, thereby providing rigidity and ease of height adjustment to address safety issues.

Features As the equipment is mechanically driven, it is unnecessary to have the grinding wheels centered perfectly. The LarsLap wheels need only to cover the seat in order to work correctly. Electric and Air Driven motors are capable of various grinding speeds for close control of the finished surface. Air motor comes as standard. Electric available upon request. Grind both seats in the same setting. The STC design enable grinding of both seats in a gate valve in the same mounting -, saving time and increasing safety as there is no need to rotate the valve.