Product Overview

The MJ-400 is a portable valve grinding machine designed for the maintenance of flat valve seats and safety valve seats within a large working range.

A synchronous three-jaw clamping frame secures the machine to the valve body, while the flexible spindle arrangement supports stable grinding under different installation conditions.

Applications

• Flat valve seats

• Safety valve seats

• Large globe valve sealing surfaces

• On-site valve maintenance

• Workshop sealing-surface restoration

Product Features

• Synchronous three-jaw clamping frame

• Spring-controlled telescopic sleeve for adjustable axial pressure

• Universal coupling for limited installation misalignment

• Bidirectional variable-speed motor drive

• Suitable for rough and fine grinding

• Stable repositioning after abrasive replacement

• Suitable for on-site and workshop maintenance

Technical Specifications

Model: MJ-400

Applications: Flat valve seats and safety valve seats

Grinding range: Φ118–450 mm

Valve size: DN100–400 (4″–16″)

Maximum grinding depth: 850 mm

Three-jaw clamping range: Φ155–595 mm

Power supply: AC 220 V / 50 Hz

Motor power: 1,300 W

Motor speed: 0–1,100 / 0–3,100 r/min

Spindle speed: 0–300 / 0–850 r/min

Equipment weight: 80 kg

Model Selection Information

The nominal valve size is provided for reference. The correct machine and grinding-disc configuration should be selected according to the actual sealing-surface diameter, valve structure, grinding depth, and available clamping space.

Please provide the following information when requesting a recommendation:

• Valve type and nominal size

• Actual flat sealing-surface diameter

• Valve-seat structure

• Required grinding depth

• Available clamping diameter

• Available installation and operating space

• Valve drawings or clear photos

• Power-supply requirements

Typical Industries

The MJ-400 is used for valve maintenance in power generation, petroleum and petrochemical processing, chemical plants, natural-gas systems, shipbuilding, metallurgy, boiler maintenance, water treatment, and general industrial maintenance.

Technical Support

Technical manuals, product-selection support, and operation guidance are available.

For model confirmation and quotation, please send your valve information and working requirements to sales@metalskingdom.com.