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Mark Product's Advanced Functional Maintenance System

Nippon Gear equipment is often used in severe operating environments. In order for plants to operate as safely as possible, it is necessary to prevent equipment problems while maintaining the high quality, precision, and functionality of all products bearing our G mark. We have developed a worldwide maintenance/support network to maintain the operating efficiency, extend the lifetime, and preserve the high safety levels of Nippon Gear equipment.

Valve Actuator's Safety Checking

When valve actuators are subjected to typical operating and environmental conditions, their electrical components, bearings, oil, and seal materials gradually wear and deteriorate. Periodic maintenance and inspection are required in order to maintain normal, consistent operation.

A Class Inspection

This onsite inspection is performed once a year with the valve actuator installed on the valve body. The inspection involves an inspection/cleaning of the wiring and electrical components, inspection of each component for loose, scratched, or damaged parts, and an operational check of electrical components.

B Class Inspection

This onsite inspection is performed once every 3 to 5 years with the valve actuator installed on the valve body. The inspection involves a partial disassembly of the actuator to allow inspection by hand, removed of the motor to inspect the surfaces of the gear teeth, and an operational check of electrical components such as gear limit switches and torque switches.

C Class Inspection

This inspection is performed once every 7 to 10 years and the valve actuator is removed from the valve body and transported to the factory. The inspection involves a complete disassembly of the actuator to allow an operational check of the gears, cleaning and replacement of parts and grease, etc. After being reconditioned, the actuator is thoroughly tested, repainted, and reinstalled at the site.

Function Test

There are various advantages to this program and one of them is the function test. We do a thorough analysis of the actuator in the factory, and then do a torque test. After that, we run an operational function test and we take all possible measures to make sure everything is reported.

Inspection of Gear Device

A special feature of Nippon Gear's gear equipment is the availability of high-value-added options such as automated control and optical communication systems. As a specialized manufacturer producing equipment that incorporates leading-edge technology, Nippon Gear provides a complete service network for its products.

Valve Actuator Diagnosis Device

?MAC Ver.6? (Motor Actuator Characterizer)

Development Details

In the past few years, everybody has been looking forward to an increase in revolution operation efficiency at various plants. That is why the plant's operation and regular inspection was rationalized. Because of this reason, electric valve inspection efficiency was progressed and to reduce the inspection time this valve actuator diagnosis device was made. As of now there are about 2,500 machines. The current operating system is ver. 6.

The Advantage of Diagnosing with Non-Disassembly

  1. Inspection Efficiency Progress
    General disassembly inspection: 1 machine/ 2-3 days
    MAC: 3-4 machine/ day
    Look at the MAC result, if necessary, dissemble, and change parts.
  2. Decrease in Inspection Cost
    Look at the MAC result; change over from TBM to CBM to create the basic data. Store the data, only dissemble what is necessary for cost down.
  3. Diagnosis under Normal Conditions
    Different from normal dissemble inspection; the valves can be checked with no dissembling; the electric valves total diagnosis is also possible.
  4. Dose Decrease of Radioactive Rays
    Radioactive dose will decrease since the time needed to work on the machine will immensely decrease
*This is Motor Operated Valve Diagnostic Analysis System (MOVDAS)
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