QNS Type High-Pressure Ball Valve

I. Product Introduction

The high-pressure ball valve emerged in the 1950s and has rapidly developed through industry technology iteration, processing technique upgrades, and valve body structure optimization. After forty years of iterative improvements, it has become a mainstream valve product in industrial pipelines. It is widely used in hydraulic machinery equipment, hydraulic control circuits, natural gas transportation, and other applications. With strong media adaptability and stable open/close control, it is a universal core control valve for hydraulic and gas pipelines.

II. Applications and Features

This valve is mainly installed at the front end of accumulators as a dedicated oil circuit shut-off device. It can also be adapted for various general hydraulic systems as a pipeline media open/close control. The ball valve open/close status is intuitively determined by the marking line on the valve stem head: when the marking line is parallel to the pipeline, it is in the open state; when perpendicular, it is in the closed state. The valve body allows bidirectional flow, and the working media can enter and exit from either end without flow direction restrictions during installation. It is suitable for nominal pressures of 10MPa, 20MPa, and 31.5MPa, with applicable media temperatures from -10°C to +80°C, compatible with hydraulic oil and emulsion as the two main working media. The valve body connector features a modular structure that allows flexible selection of fittings based on on-site pipeline installation requirements, adapting to various pipeline connection conditions.

III. Working Principle

The high-pressure ball valve is driven by the valve stem to operate the ball opening/closing component, rotating around the valve stem axis as the center. By rotating the ball to change the position of the internal flow port, it achieves pipeline media conduction and cut-off, completing oil circuit and gas circuit on/off control. The valve body rotary open/close resistance is small, making operation convenient and sealing reliable.

IV. Core Product Features

1. Bidirectional Flow Design: Media can flow in both directions with no installation flow direction requirements, providing high on-site installation fault tolerance.

2. Intuitive Open/Close Indicators: Valve stem marking line visually indicates open/close status without checking pipeline pressure, ensuring convenient maintenance.

3. Complete Pressure Ratings: Suitable for 10MPa, 20MPa, and 31.5MPa three-level high-pressure hydraulic pipelines, compatible with accumulator high-pressure oil circuits.

4. Wide Media Compatibility: Compatible with hydraulic oil and emulsion, suitable for standard industrial hydraulic media temperature ranges.

5. Modular Connector Structure: Modular fitting selection adapts to flanged, threaded, and clamped pipeline connection methods.

6. Easy Open/Close Operation: Ball rotary open/close provides fast operation speed and excellent sealing performance under high-pressure conditions.

7. Mature Industry Technology: After years of structural improvements, it offers pressure resistance and wear resistance, suitable for long-term use in hydraulic and gas industries.

V. Application Fields

Primarily used with various accumulator front-end oil circuit shut-off protection. Also suitable for complete hydraulic equipment hydraulic circuits, industrial hydraulic pump stations, natural gas transportation pipelines, and industrial fluid pipelines. Used for manual pipeline media open/close, oil circuit isolation, and equipment maintenance shut-off operations.

VI. Usage Precautions

1. The selected valve body pressure rating must match the system nominal pressure; prolonged use above 31.5MPa high pressure is prohibited.

2. Check the valve stem marking line before operation to confirm open/close status, avoiding half-open/half-closed conditions that cause valve body erosion and wear.

3. Select appropriate modular fittings based on pipeline specifications, and ensure proper tightening to prevent oil leakage and gas seepage at interfaces under high-pressure conditions.

4. Strictly control media temperature within the -10°C to +80°C range; exceeding temperature limits will accelerate seal aging and failure.

5. Operate the valve body with smooth, uniform rotation; do not forcefully wrench the valve stem to avoid ball displacement and sealing surface damage.

6. Regularly clean valve chamber impurities during long-term use to prevent particle impurities from jamming the ball, which would affect sealing and open/close operation.