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MECLINE

MECLINE is a brand of fluid-handling components used in pressure-washer and industrial pump circuits. The line is distributed globally by 3G Electric and covers two primary product families: unloader valves and brass inline piston check valves. Unloader valves in the MECLINE range are built with brass bodies and NPT threaded connections, with bypass ports sized at 3/8-inch or 1/2-inch NPT. Maximum operating pressure ratings across the two unloader SKUs currently listed are 2,900 psi and 4,800 psi, covering the working ranges of many positive-displacement pump systems. The check valve family uses a brass inline piston design with female NPT connections on both ends, available in 1/4-inch, 3/8-inch, and 1/2-inch pipe sizes. These valves permit flow in one direction and block reverse flow, and are intended for water, air, and light oil lines. The brass construction provides corrosion resistance in the media and environments typical of these applications. For technical buyers, the relevant selection variables are straightforward: bypass connection size and thread type for unloaders, maximum operating pressure relative to the pump's relief setting, and pipe size plus end connection for check valves. MECLINE part numbers follow a consistent format, such as VR54-200 and VRT100-330 for unloaders, and CV3-40012, CV3-31014, and CV3-40038 for check valves, which simplifies cross-referencing during maintenance and replacement. 3G Electric supplies the MECLINE line with multiple SKUs available and provides logistics support for orders shipping to industrial, municipal, and commercial sites worldwide. The catalog entries include manufacturer part numbers, connection types, pressure ratings, and body materials so that procurement and maintenance teams can match a replacement to an existing installation without ambiguity. Where a system requires a specific bypass size or pressure threshold, the two unloader options cover common low- and high-pressure configurations, while the three check valve sizes address the small-diameter piping runs frequently found on pump discharge and inlet lines. Because these are wear components, having the correct part number on hand reduces downtime when a valve needs to be swapped. 3G Electric's role is to keep the MECLINE range orderable with clear specifications and to coordinate delivery to the buyer's location, whether the requirement is a single replacement valve or a scheduled quantity for a maintenance program.

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About MECLINE

MECLINE is a brand of fluid-handling components used in pressure-washer and industrial pump circuits. The line is distributed globally by 3G Electric and covers two primary product families: unloader valves and brass inline piston check valves. Unloader valves in the MECLINE range are built with brass bodies and NPT threaded connections, with bypass ports sized at 3/8-inch or 1/2-inch NPT. Maximum operating pressure ratings across the two unloader SKUs currently listed are 2,900 psi and 4,800 psi, covering the working ranges of many positive-displacement pump systems. The check valve family uses a brass inline piston design with female NPT connections on both ends, available in 1/4-inch, 3/8-inch, and 1/2-inch pipe sizes. These valves permit flow in one direction and block reverse flow, and are intended for water, air, and light oil lines. The brass construction provides corrosion resistance in the media and environments typical of these applications. For technical buyers, the relevant selection variables are straightforward: bypass connection size and thread type for unloaders, maximum operating pressure relative to the pump's relief setting, and pipe size plus end connection for check valves. MECLINE part numbers follow a consistent format, such as VR54-200 and VRT100-330 for unloaders, and CV3-40012, CV3-31014, and CV3-40038 for check valves, which simplifies cross-referencing during maintenance and replacement. 3G Electric supplies the MECLINE line with multiple SKUs available and provides logistics support for orders shipping to industrial, municipal, and commercial sites worldwide. The catalog entries include manufacturer part numbers, connection types, pressure ratings, and body materials so that procurement and maintenance teams can match a replacement to an existing installation without ambiguity. Where a system requires a specific bypass size or pressure threshold, the two unloader options cover common low- and high-pressure configurations, while the three check valve sizes address the small-diameter piping runs frequently found on pump discharge and inlet lines. Because these are wear components, having the correct part number on hand reduces downtime when a valve needs to be swapped. 3G Electric's role is to keep the MECLINE range orderable with clear specifications and to coordinate delivery to the buyer's location, whether the requirement is a single replacement valve or a scheduled quantity for a maintenance program.

Common Applications

  • Pressure-washer pump circuits — MECLINE VR54-200 unloader valve with 3/8-inch NPT bypass for systems up to 2,900 psi
  • High-pressure water systems — MECLINE VRT100-330 unloader valve with 1/2-inch NPT bypass rated to 4,800 psi
  • Pump discharge lines — MECLINE CV3-40012 1/2-inch brass inline piston check valve to prevent backflow
  • Small-diameter water and air piping — MECLINE CV3-31014 1/4-inch brass inline piston check valve
  • Light oil lines — MECLINE CV3-40038 3/8-inch brass inline piston check valve for one-directional flow
  • Industrial spray systems — MECLINE unloader valves to regulate flow and protect pumps from overpressure

Frequently asked questions

Common questions about MECLINE from 3G Electric.

What pressure ratings are available in the MECLINE unloader valve range?

The MECLINE unloader valves currently listed carry maximum operating pressure ratings of 2,900 psi and 4,800 psi. The 2,900 psi model, part number VR54-200, uses a 3/8-inch NPT bypass connection. The 4,800 psi model, part number VRT100-330, uses a 1/2-inch NPT bypass connection. Both have brass bodies and NPT threads. When selecting, match the valve's maximum operating pressure to the pump's relief or bypass setting so the valve is not the limiting component in the circuit. Confirm the bypass port size against the existing plumbing before ordering.

What pipe sizes are offered for MECLINE brass inline piston check valves?

MECLINE brass inline piston check valves are available in 1/4-inch, 3/8-inch, and 1/2-inch pipe sizes. All three use female NPT connections on both ends (FNPT x FNPT) and a brass inline valve body. The corresponding part numbers are CV3-31014 for 1/4-inch, CV3-40038 for 3/8-inch, and CV3-40012 for 1/2-inch. These valves are intended for water, air, and light oil lines and allow flow in one direction only. Select the size that matches the existing pipe run; the inline body installs directly in the line without additional adapters when the pipe thread matches.

What media are MECLINE check valves suitable for?

The MECLINE brass inline piston check valves are specified for water, air, and light oil lines. The brass body provides corrosion resistance for these media in typical industrial and commercial piping environments. They are not represented as suitable for aggressive chemicals, steam, or media that would attack brass. If the application involves a fluid outside water, air, or light oil, verify compatibility with the wetted materials before installation. The piston design blocks reverse flow and permits flow in one direction, which makes it appropriate for pump discharge lines, inlet lines where backflow must be prevented, and similar circuits.

How do I identify the correct MECLINE replacement part number?

MECLINE part numbers are listed with each catalog entry. For unloader valves, VR54-200 corresponds to the 3/8-inch NPT bypass, 2,900 psi model, and VRT100-330 corresponds to the 1/2-inch NPT bypass, 4,800 psi model. For check valves, CV3-31014 is 1/4-inch, CV3-40038 is 3/8-inch, and CV3-40012 is 1/2-inch. To confirm a replacement, check the existing valve's part number if legible, or measure the pipe or bypass connection and note the system's operating pressure. Matching both the connection size and the pressure rating avoids installing a valve outside its rated range.

What connection type do MECLINE unloader valves and check valves use?

MECLINE unloader valves use NPT threads, with the bypass connection specified as either 3/8-inch NPT or 1/2-inch NPT depending on the model. MECLINE brass inline piston check valves use female NPT connections on both ends, listed as FNPT x FNPT. NPT is a tapered thread standard common in North American and many international industrial piping systems. Because NPT relies on thread engagement for sealing, proper installation with compatible sealant or tape is required. Confirm that the mating fittings on the existing line are NPT before ordering to avoid mismatch with other thread standards.

What body material is used in MECLINE unloader and check valves?

Both the MECLINE unloader valves and the MECLINE inline piston check valves use brass bodies. Brass is selected for these components because it resists corrosion in water, air, and light oil service and machines well for threaded valve bodies. The unloader valve listings specify a brass body with NPT threads, and the check valve listings specify a brass inline valve body with FNPT x FNPT connections. Brass is not intended for all media; verify chemical compatibility for any fluid outside the stated water, air, and light oil applications before installation.