Stainless Steel Insulated Ball Valves

Bolaisi Valve boasts advanced production technology and strict quality control, providing reliable industrial valve solutions. The stainless steel insulated ball valves from Bolaisi is a heavy-duty shut-off valve, with full stainless steel construction and stable thermal control. As a professional supplier, we manufacture it to international standards, offering wholesale and customized services, ensuring high quality and long service life for petrochemical, pharmaceutical and other industries.

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Product Description

A stainless steel insulated ball valve is a heavy-duty rotary shut-off and control valve engineered specifically for high-viscosity, easily crystallizing and temperature-sensitive fluids. Built with full stainless steel construction and an integrated jacketed insulation structure, this stainless steel ball valve maintains stable media temperature to prevent solidification, crystallization and viscosity increase during pipeline operation.

Combining the fast-action performance of a ball valve with highly efficient thermal control, the stainless steel insulated ball valve is manufactured in strict compliance with GB, API and ASME international standards. It delivers reliable sealing, low heat loss and long service life in demanding petrochemical, pharmaceutical, food, LNG and metallurgical applications. As a direct insulated ball valve manufacturer, we supply DN15–DN600 jacketed ball valves with full material traceability and 100% pressure testing before shipment. Our factory also produces a full range of industrial valves, including gate valves, globe valves, check valves, and butterfly valves.

Stable Thermal Control

Jacket or vacuum jacket design supports steam, thermal oil or insulation materials. Temperature accuracy up to ±1℃ with minimal heat loss.

Full Stainless Steel Body

Available in 304, 316, 316L and 310S for excellent corrosion resistance, high-temperature resistance and clean service compatibility.

Reliable Sealing Performance

Soft seal (enhanced PTFE/PPL) reaches Class VI leakage rate. Hard seal (Stellite alloy) withstands up to 550℃ and meets ISO 5208 Class A.

Smooth Operation, Long Life

0°–90° rotation for fast opening and closing. Floating or fixed ball design, low torque for manual, pneumatic or electric actuation.

Anti-Clog & Low Flow Resistance

Full port or reduced port options. Ideal for high-viscosity media to minimize pressure drop and prevent pipeline blockage.

International Standard Compatibility

Fully conforms to GB, API and ASME standards, suitable for international projects, EPC procurement and direct export.

Structure & Working Principle

The valve consists of a stainless steel body with insulation jacket, stainless steel ball, seat, stem, packing and connection ends.

Rotate the ball 0°–90° to achieve on-off and flow regulation.
The insulation jacket circulates steam or thermal oil, or uses thermal insulation material, to maintain a stable internal temperature. For a dedicated jacketed design, see our stainless steel jacket insulated ball valves.
The vacuum jacket version is specially designed for ultra-low temperature conditions down to -196℃.

Technical Specifications

Basic Parameters

Item	Specification
Model	BQ41F-16P / 25P / 40P, BQ347H-64P / 100P
Nominal Diameter	DN15 – DN600
Nominal Pressure	PN16 – PN100 (Class 150 – Class 600)
Jacket Working Pressure	≤ 1 MPa
Working Temperature	Insulation: -29℃ to 550℃ Cryogenic insulation: -196℃ to -29℃
Connection	Flange RF (GB/T 9113, ASME B16.5); Thread; Tri-Clamp
Structure	Jacketed / Vacuum Jacketed; Floating Ball / Fixed Ball
Seal	Soft Seal (PTFE / PPL) ≤200℃ Hard Seal (Stellite) ≤550℃

Main Materials

Component	Material Options
Body, Bonnet, Jacket	304 (CF8), 316 (CF8M), 316L (CF3M), 310S
Ball	SS304 / SS316, polished Ra ≤ 0.8μm; Stellite 6 for hard seal
Stem	316 / 316L; 17-4PH for high temperature service
Seat	PTFE, PPL, Stellite, PEEK (sanitary grade)
Packing	Flexible Graphite ≤650℃
Fasteners	SS304 / SS316

Design & Testing Standards

Design Standards

GB/T 12237, GB/T 21385, API 608, ASME B16.34

Dimensions

GB/T 9113, ASME B16.5, GB/T 12221, ASME B16.10

Inspection

GB/T 13927, API 598, Helium Leak Detection, API 607 (optional)

Materials

GB/T 1220, GB/T 13901, ASTM A182

Typical Applications

The stainless steel insulated ball valve is widely used in processes involving temperature-sensitive media:

Petrochemical Industry: asphalt, heavy oil, resin, molten sulfur, paraffin
Pharmaceutical & Food: syrups, chocolate, medicinal solutions, hygienic fluids
LNG & Low Temperature: liquefied natural gas, cryogenic transport. For these extreme conditions, our stainless steel ball valves are also widely used.
Chemical & Fiber: polymers, adhesives, easily crystallized chemicals
Metallurgy & Energy: high-temperature heat transfer oil systems

Selection Guide

By Temperature

Normal insulation (-29℃ to 425℃): jacketed type
Ultra-low temperature (-196℃ to -29℃): vacuum jacket type
High precision control: with intelligent temperature control port

By Material

General corrosion: 304
Strong corrosion / sanitary: 316L
Extreme high temperature: 310S

By Seal

Clean, low viscosity media: soft seal (PTFE / PPL)
High temperature, abrasive media: hard seal (Stellite)

By Pressure & Size

High pressure (≥ PN40) or large size (≥ DN200): fixed ball design
High viscosity media: full port recommended. For automated lines, see our stainless steel electric ball valves.

Installation, Operation & Maintenance

Install horizontally to ensure the jacket flow is unobstructed.
Preheat or precool the valve before startup to avoid thermal shock.
Operate only within 0°–90°; do not over-rotate.
Check for leaks regularly at flanges, packing and jacket connections.
Lubricate stem bearings every 3–6 months with high-temperature grease.
Drain the jacket medium before long-term shutdown.

Why Choose Bolaisi Valves

Verified Quality System

Certified to GB/T 19001-2016 / ISO 9001:2015 international quality management system.

In-House Manufacturing

Casting, machining, assembly and testing are completed in our own Wenzhou factory for full process control.

100% Pressure Tested

Every insulated ball valve is shell-tested and seat-tested to API 598 before delivery.

Engineering Support

Our technical team helps you select the right jacket type, seat material and port design for your medium.

Export Experience

Products supplied to petrochemical, pharmaceutical, food and LNG projects worldwide with full documentation. We also offer carbon steel ball valves for cost-sensitive projects.

OEM & ODM Available

Custom sizes, materials, actuation and nameplate branding supported. Three-way ball valves and other special designs are available on request.

Stainless Steel Insulated Ball Valve Product Image

Stainless Steel Insulated Ball Valves – Jacketed Thermal Ball Valve for High-Viscosity Media — Stainless Steel Insulated Ball Valves — jacketed and vacuum jacketed designs, DN15–DN600, PN16–PN100.

Frequently Asked Questions

What is a stainless steel insulated ball valve used for?

It is used to shut off and regulate high-viscosity, easily crystallizing or temperature-sensitive fluids such as asphalt, molten sulfur, resin, chocolate syrup and liquefied natural gas, where the medium must be kept above or below a specific temperature to stay flowable.

What is the difference between a jacketed and a vacuum jacketed ball valve?

A jacketed ball valve uses a steam or thermal oil jacket to keep medium temperature between -29℃ and 550℃. A vacuum jacketed ball valve uses a vacuum layer instead, which is the preferred choice for cryogenic service down to -196℃.

What temperature range can insulated ball valves handle?

Standard jacketed models cover -29℃ to 550℃. With a vacuum jacket, cryogenic models cover -196℃ to -29℃. Soft seat seals (PTFE / PPL) are limited to 200℃, while hard seat seals (Stellite) handle up to 550℃.

Can you supply large diameter insulated ball valves?

Yes. We manufacture insulated ball valves from DN15 to DN600, with fixed ball structure recommended for sizes ≥ DN200 or pressures ≥ PN40. For flanged connections, we also offer stainless steel flanged ball valves.

Do you offer OEM / ODM insulated ball valve manufacturing?

Yes. As a direct factory, we support custom body materials, seat materials, port design, actuation (manual, pneumatic, electric) and customer branding. Send your drawing or specification and we will quote accordingly.

What is the lead time and MOQ?

Standard models are typically shipped within 15–25 working days after order confirmation. MOQ is flexible for trial orders and sample evaluation. Please contact us for details.