Product Overview

The Nitrogen Charging Valve MG00.21.27.01 is a specialized high-pressure charging and pressure-retaining component designed for the pull-rod accumulators of ZGM medium-speed roller pulverizers. It is primarily used for nitrogen  charging, pressure testing, and pressure maintenance within the accumulator bladder.

As an indispensable precision control component in the pulverizer's hydraulic loading system, it is widely utilized in the coal grinding systems of major thermal power plants. It is a high-frequency replacement part during power plant maintenance and pulverizer overhauls.

Key Specifications:

• Target Equipment: ZGM Series Pulverizers (ZGM80, ZGM95, ZGM113, ZGM123, etc.).

• Working Medium: Nitrogen .

• Material: High-quality carbon steel body with a stainless steel valve core.

• Operating Temperature: -200℃ to +80℃

• Core Function: Ensures safe nitrogen charging, precise pressure retention, and leakage prevention to stabilize hydraulic loading and prevent roller vibration.

Technical Features & Advantages

• High-Pressure Structural Integrity: Engineered to meet the high-pressure standards of hydraulic accumulators. The high-strength carbon steel body resists leakage and deformation under rated operating pressures.

• Stainless Steel Valve Core: The stainless steel core provides superior corrosion and wear resistance. It prevents sticking and rusting, ensuring smooth operation and long-term sealing performance in high-dust environments.

• Superior Sealing Performance: Features a multi-layered sealing structure with precision-ground contact surfaces. This achieves excellent airtightness, reducing the frequency of nitrogen refills and lessening the maintenance workload.

• Seamless Compatibility: Produced strictly to original ZGM factory dimensions. It perfectly matches the pull-rod accumulator bladder interface, allowing for quick installation and replacement without modifications.

• Low Maintenance: The simplified design results in a low failure rate. Routine maintenance only requires checking the dust cap integrity and verifying the seal, significantly lowering long-term O&M costs.

ZGM Pulverizer Complementary Spare Parts List

The following components work in synergy with the MG00.21.27.01 to maintain the stability of the pulverizer's hydraulic and grinding systems:

Application Scenarios

The Nitrogen Charging Valve MG00.21.27.01 is specifically designed for the hydraulic loading systems of ZGM80 through ZGM123 pulverizers.

1. Nitrogen Charging & Pressure Detection

During initial installation, commissioning, or routine pulverizer overhauls, this valve is used to fill the accumulator bladder with nitrogen and calibrate the pre-charge pressure. This ensures the hydraulic loading system meets technical specifications for consistent roller pressure.

2. System Pressure Maintenance

During long-term operation, the valve prevents nitrogen leakage, which is critical for maintaining the "spring effect" of the accumulator. This buffers the impacts generated during the coal grinding process, protecting the hydraulic cylinders and pull rods from fatigue damage.

3. Routine Inspection & Maintenance

In accordance with ZGM pulverizer maintenance manuals, the valve is a key inspection point. If pressure loss or core damage is detected during minor or major overhauls, the valve is replaced to restore the hermetic integrity of the hydraulic system.

HKZX-2026-02-28