Kugelventil

Globe valves are among the most versatile and essential flow control components in industrial piping systems. Renowned for their reliable sealing, precise flow regulation, and low-maintenance design, they are widely used across hydropower, chemical processing, petroleum, HVAC, and pharmaceutical industries.

Basic Definition & Core Functions

A globe valve is a linear-motion, forced-sealing valve where the disc moves vertically along the centerline of the valve seat to regulate or shut off fluid flow. Composed of a valve body, disc, seat, stem, and actuator, it features a simple yet robust structure. Unlike gate valves or ball valves, globe valves are unidirectional and must be installed according to the designated flow direction.

·Fluid Isolation: Completely opens or stops media flow for water supply, oil, gas, and chemical lines.

·Precise Flow & Pressure Control: Adjusts the opening height of the disc to fine-tune flow rates and working pressure, making it ideal for throttling.

·System Protection: Performs reliably under medium to high pressures, effectively preventing backflow and isolating pipeline faults.

How Globe Valves Work

This type of valve operates on a straightforward forced-sealing principle. When opening, the stem lifts the disc away from the seat, allowing fluid to flow through the S-shaped passageway. When closing, the actuator pushes the stem downward, forcing the disc against the seat to form a bubble-tight seal. Although the tortuous flow path introduces slightly higher resistance, it enables exceptional throttling capability and minimizes seat wear during frequent operation.

Product Classifications & Key Types

To accommodate varied working conditions, these valves come in diverse configurations:

By Design & Structure

Straight-through (standard S-flow design), Y-pattern/DC (inclined stem for reduced pressure drop), and Angle types (90° right-angle pattern for space savings).

By Sealing Type

Soft/Gland-packed sealing (cost-effective for general utilities) and Bellows Seal designs (zero-leakage design for toxic, explosive, or ultra-pure media).

By Connection Type & Standards

Flanged Globe Valves: Includes standard ANSI and GB flange designs for medium-to-large high-pressure industrial lines.

Forged & Welded Types: Such as Stainless Steel Forged Steel Internal Thread Socket Welding Globe Valves and Stainless Steel Forged Steel Flange Globe Valves, delivering superior pressure resistance.

Threaded Ends: Ideal for compact, low-pressure piping systems (DN15–DN50).

Specialized Industrial Applications

Cryogenic Service: Stainless Steel Forged Steel Low Temperature models engineered for sub-zero liquid handling.

Self-Sealing & High Pressure: Stainless Steel Forged Self-sealing models designed for extreme operating conditions.

Media-Specific Valves: Specialized options including Stainless Steel Flange Ammonia Shut-off Valves and Thermal Shut-off Valves.

By Actuation: Manual (handwheel), Electric (for automated systems), and Pneumatic (fast-acting and explosion-proof).

Globe Valve vs. Gate Valve

Frequently Asked Questions

Q1: Can Bolaisi valves be installed in reverse flow direction?

No. These valves are strictly unidirectional and follow the "low-in, high-out" flow principle. Installing the valve in reverse will compromise sealing integrity, cause operational sticking, and potentially damage the disc and seat, drastically reducing service life. Always align installation with the flow arrow marked on the valve body.

Q2: Can the valves remain partially open for long-term operation?

Yes. Unlike gate valves (which must be fully open or fully closed), Bolaisi valves excel at prolonged partial-open throttling and pressure regulation. Their wear-resistant disc and seat designs ensure stable performance under continuous throttling without rapid erosion.

Q3: Why are the valves widely used in industrial pipelines despite higher flow resistance?

Although they have higher fluid resistance due to their tortuous flow path, they provide superior throttling, pressure regulation, and reliable sealing that gate valves cannot offer. Furthermore, our Bolaisi Y-pattern / DC designs significantly reduce pressure drop while maintaining excellent sealing capabilities.

Q4: Which is better for throttling: a globe valve or a ball valve?

For precise and fine flow regulation, this design is a suitable choice because its disc movement provides a direct, linear correlation with flow area. Ball valves are better suited for quick quarter-turn isolation; using them for micro-throttling can cause localized seat erosion and inaccurate flow control.

Q5: What are the common faults in the valves and how can they be prevented?

Common issues include seat leakage, stem jamming, and hard operation. Prevention tips:

1.Ensure correct directional installation.

2.Avoid operating beyond rated pressure and temperature limits.

3.Flushing pipelines prior to operation to remove debris.

4.For hazardous or zero-leakage applications, select Bolaisi Bellows Seal models to eliminate external leakage risks completely.

Q6: How do I choose between flanged and threaded (screwed) types?

Threaded (Screwed) Globe Valves: Ideal for small pipelines (DN15–DN50), low-pressure utility lines, and tight installation spaces due to low cost and easy maintenance.

Flanged Globe Valves (ANSI/GB Standards): Recommended for larger diameters (DN65+), high-pressure industrial systems, and main process lines requiring superior sealing integrity and structural strength.