Stainless Steel Insulated Ball Valves

A stainless steel insulated ball valves 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 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 valves 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.

Key Features & Advantages

Stable Thermal Control System

Jacket or vacuum jacket design supports steam, thermal oil, or insulation materials. Temperature accuracy can reach ±1℃, greatly reducing heat or cold loss.

Full Stainless Steel Corrosion Resistance

Available in 304, 316, 316L, and 310S stainless steel 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 temperatures up to 550℃ and meets ISO 5208 Class A.

Smooth Operation & Long Service Life

0°–90° rotation for fast opening and closing. Available with floating or fixed ball design. Low operating 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

The stainless steel insulated ball valves fully conforms to global standards, making it suitable for international projects 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, thermal oil, or uses thermal insulation material to maintain stable internal temperature.

● Vacuum jacket version is specially designed for ultra-low temperature conditions down to -196℃.

Technical Specifications

Basic Parameters

Main Materials

Design & Testing Standards

● Design: 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 valves 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 Temp: Liquefied natural gas, cryogenic transport

● Chemical & Fiber: Polymers, adhesives, easily crystallized chemicals

● Metallurgy & Energy: High-temperature heat oil systems

Selection Guide

By Temperature

● Normal insulation (-29℃ to 425℃): jacketed type

● Ultra-low temperature (-196℃ to -29℃): vacuum jacket

● 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: soft seal (PTFE/PPL)

● High temperature, abrasive media: hard seal (Stellite)

By Pressure & Size

● High pressure (≥PN40) / large size (≥DN200): fixed ball

● High viscosity: full port recommended

Installation, Operation & Maintenance

● Install horizontally to ensure 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 jacket medium before long-term shutdown.