Product Name: Cover, Pneumatic Actuator Assembly (Normally Closed) – Part No. 00080028

Description:
This component is the protective cover for a Normally Closed (NC) pneumatic actuator assembly, specifically designed for high-pressure waterjet cutting systems . Rated for continuous operation up to 60,000–90,000 PSI (approximately 4,137–6,480 bar), this cover serves as an external debris shield that mounts onto the top of the pneumatic actuator cylinder . It is constructed from durable, impact-resistant material to withstand harsh workshop environments.

The cover is a standard component in the complete NC pneumatic actuator assembly (OEM assembly number 10177855), where it is listed as Item 10 . Its primary function is to prevent abrasive garnet dust, water mist, and fine particulate debris from accumulating on the actuator‘s internal moving components—specifically the piston rod, wiper seal, and compression springs—thereby ensuring reliable, long-term operation and reducing maintenance frequency .

Applications:

• Mounted on top of Normally Closed (NC) pneumatic actuators used in waterjet on/off valves (water switches)

• Protects the actuator’s internal cylinder, piston, and seal stack from abrasive contamination in high-dust environments

• Suitable for 60,000–90,000 PSI (60K–94K) ultra-high pressure waterjet systems

• Compatible with KMT AccuStream, H2O Jet, and other standard waterjet actuator assemblies

• Typically serviced during preventive maintenance or when the actuator is disassembled for seal replacement

Features:

• Protective Debris Shield: Prevents abrasive garnet dust and water mist from entering the actuator's internal mechanism, which would otherwise cause premature wear, seal failure, and sluggish valve response 

• Normally Closed (NC) Actuator Compatibility: Specifically designed for NC pneumatic actuators where the valve remains closed when no air pressure is applied—a critical safety feature ensuring the waterjet stops automatically if air supply is lost 

• Lightweight Design: Weight is approximately 0.05 lbs (0.023 kg) for easy handling during maintenance 

• Direct OEM Replacement: Interchangeable with KMT part numbers 00080028 and 05052899, and WSI part number VL00080028 

• Corrosion-Resistant: Constructed from material suitable for exposure to water, abrasive dust, and hydraulic fluids in waterjet environments

Maintenance:

Failure Diagnosis (When to Replace):

• Cracked or Damaged Cover: Visible cracks, deformation, or impact damage that compromises the cover's ability to seal out debris

• Abrasive Buildup on Actuator: If abrasive dust is found accumulating on the actuator piston rod or around the wiper seal during inspection, the cover may be damaged, missing, or improperly seated

• Sluggish Actuator Response: Slow or erratic opening/closing of the waterjet valve may indicate that abrasive contamination has entered the actuator due to a failed cover

• Visible Wear: Chipping, cracking, or material degradation from prolonged exposure to water, UV light, or chemicals

• Scheduled Preventive Maintenance: Inspect the cover during routine actuator service; replace if any signs of wear or damage are evident

Inspection and Replacement Guidelines:

• Full Depressurization (Critical): Before any maintenance, fully depressurize the waterjet system (high-pressure water, hydraulic system, and air supply) and follow lockout/tagout procedures

• Removal: The cover is typically secured by a retaining ring or snap ring (Item 4 in the actuator assembly: 10177772) . Use appropriate tools to remove the retaining ring and lift off the cover

• Inspect Cover Condition: Examine the cover for cracks, deformation, or wear. If the cover is damaged, it will not properly seal the actuator from abrasive contamination

• Clean Actuator Top: Before installing a new cover, thoroughly clean the top of the actuator cylinder and remove any accumulated abrasive dust or debris using low-pressure air or a soft cloth

• Inspect Wiper Seal: The wiper seal (Item 3: 10177780) is located beneath the cover . Inspect it for wear or damage; replace if necessary

• Install New Cover: Place the new cover over the actuator top, ensuring it seats properly. Secure it with the retaining ring, ensuring it is fully seated in its groove

• Verify Proper Seating: After installation, the cover should fit snugly and not move excessively when the actuator cycles

• Replace as Part of Actuator Service: While the cover is not a high-wear consumable, it should be inspected during major pump overhauls and replaced if any damage is detected. If the actuator is being rebuilt, it is best practice to install a new cover

• Store Properly: Store spare covers in a clean, dry environment to prevent damage before use

Cross-Reference Information:

• KMT #: 00080028

• KMT Alternative #: 05052899

• WSI #: VL00080028

• Weight: 0.05 lbs (0.023 kg) 

• Component of Pneumatic Actuator Assembly: 10177855 (Item 10) 

• Works with: Retaining Ring (10177772) and Wiper Seal (10177780) 

• Rated Pressure: 60,000–90,000 PSI (4,137–6,480 bar)