Stainless Steel High-temperature Blowdown Ball Valves

The Stainless Steel High-Temperature Blowdown Ball Valves is a shut-off valve specifically engineered for high-temperature and impurity-laden service conditions. Constructed from heat-resistant stainless steel and equipped with a metal hard-sealing system, the valve delivers reliable sealing and smooth operation under severe thermal environments.

The valve operates through a 90° rotation of the ball. When the bore aligns with the pipeline, the medium is discharged rapidly; when rotated closed, the high-temperature sealing system ensures tight shut-off. Compared with conventional globe valves and plunger valves, the Stainless Steel High-Temperature Blowdown Ball Valves offers better wear resistance, anti-erosion performance, and longer service life, making it suitable for continuous or frequent blowdown duty.

Designed in accordance with GB/T 26145-2010 and related standards, the valve is built for safe and stable operation in demanding industrial systems.

Key Product Features

Heat-Resistant Stainless Steel Construction

The valve body and bonnet are available in 316L, 321, or 310S stainless steel to match different temperature ranges, providing strong corrosion resistance and high-temperature oxidation resistance.

Metal Hard-Sealing System

The seat and ball are overlaid with Stellite alloy or coated with tungsten carbide. This high-hardness sealing pair maintains reliable sealing even in media containing solid particles.

Full-Port Anti-Clog Flow Path

The straight-through large bore design improves blowdown efficiency and reduces the risk of blockage, especially in applications with sludge or debris.

Extended Bonnet for Thermal Protection

The long-neck bonnet design isolates heat from the packing area, protecting stem sealing components and improving operational reliability in high-temperature service.

Smooth and Stable Operation

With a trunnion-mounted ball and anti-seize design, the Stainless Steel High-Temperature Blowdown Ball Valves maintains low operating torque and stable performance even under thermal expansion conditions.

Main Technical Parameters

Material Specifications

Typical Applications

The Stainless Steel High-Temperature Blowdown Ball Valves is widely used in systems requiring reliable high-temperature blowdown control:

Petrochemical processing units

Power plant boiler blowdown lines

Metallurgical high-temperature pipelines

Rubber and paper industries

Heat transfer oil systems

High-temperature wastewater with particles

It is particularly suitable for harsh services involving high temperature, high pressure, and solid contaminants.

Selection Guidelines

To ensure proper performance of the Stainless Steel High-Temperature Blowdown Ball Valves, consider the following:

Temperature Matching

≤600°C: 316L

600–650°C: 321

＞650°C: 310S

Seal Selection

Mild particle service: Stellite hard seal

Severe erosion: Tungsten carbide coating

Always use high-temperature graphite packing

Pressure & Size Matching

Select PN rating based on pipeline design pressure. Under high temperature, allowable pressure must be corrected per GB/T 12224. Choose bore size according to flow rate and particle size.

Special Media

For sour service, upgrade materials per NACE MR0175 if required.

Installation & Maintenance Notes

Orient the extended bonnet away from major heat sources

Tighten flange bolts evenly in a cross pattern

Open the valve slowly during blowdown to avoid water hammer

Apply high-temperature grease every 3–6 months

Periodically inspect sealing surfaces for wear

Fully open and flush the valve before long shutdowns

Proper installation and routine maintenance will significantly extend service life and reduce unplanned downtime.