Dust Stoppers

• The Dust Stopper was designed for the nuclear industry to prevent contaminated dust from entering the pipeline system.
• The Dust Stopper is easily screwed into the driving head to keep grinding dust out of the pipe
• A rubber ring scrapes dust from the valve wall when drive shaft/drive head is removed to change grinding paper
• The contaminated grinding dust is contained in the Dust Stopper with a minimal amount collecting in the valve body
• The Dust Stopper seats 1⁄2" to 1" below the seat with a moving center which permits adjustment of the grinding heads
• For extra security a "balloon" attachment is available

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Remote Control for Model G and FL

• Remote Control system is designed to reduce the exposure time of plant personnel during repair & maintenance of valves in containment addressing ALARA concerns.
• Permits remote operation of valve grinders located up to 100 feet away from valve being serviced.
• Grinding is viewed and controlled by a monitor and motors assembled on the machine.
• Change grinding paper as required (Use of permanent diamond or BN grinding plates will reduce exposure, as grinding paper change will not be required)

Via use of TV monitor, camera and sound system the operator can control:

Vertical Adjustment of the grinder
Horizontal Adjustment
Grinding Pressure
Rotation Speed
Direction of Rotation

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Re-Establishing the O.D. (Outside Diameter) of 3 Degrees for use with Model G and FL

• Re-establishes the opoutside diameter lost due to removal of seat material during grinding.
• Valve sizes 1"- 47+"
• Reduces the loss of the outside diameter and result in a longer seat life of the valve.
• The LarsLap Model S-C (1/2" to 4") is standard with reversible grinding plate to re-establish the O.D. of 3 degrees.
• Larger valves, 2 1⁄2" to 48", require an additional accessory kit which provides Guiding Plates and grinding heads for use with the Models FL and G
• The grinding heads are manufactured with the 3-degree (or degree specified) and are attached to the FL or G driving plates
• LarsLap's state of the art technology (stationary center) allows a guiding plate to be attached to the driving head to act as a pilot for the angle cut.
• The guide plate sits stationary approximately 1" below the seat in the bore
• 3 degree accessory as standard.
• Customized angle available upon request.

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Radius Grinding (Chamfering) For Gate Valves

• Accessory for establishing a radius on the Inside and Outside diameter of Gate Valves
• For Gate valve sizes 2 1/2"- 47+"
• Radius grinding (Chamfering) is the recommended method of chamfering the wedge and seat for proper entry and seating of the valve.
• LarsLap offers radius grinding as a method that prevents cutting action seat damage by producing a smooth meeting between the seats
• The procedure is much the same as re-establishing the OD of 3 degrees, however in this case a gradual radius must be re-established to prevent seat leakage.

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