Pneumatic Diaphragm High Temperature Control Valve

Designed for demanding high-temperature process services, the Pneumatic Diaphragm High Temperature Control Valve combines a heat-resistant valve body and trim with a pneumatic diaphragm actuator to provide stable and precise flow regulation under elevated operating temperatures. Its extended bonnet and thermal isolation arrangement help reduce heat transfer toward the packing and actuator area, while application-specific trim materials maintain control performance under thermal stress.

The valve is particularly suited for high-temperature steam, hot oil, gas, petrochemical, refinery, power generation, and other process applications where conventional control valves may be limited by temperature. Engineered flow passages and specialized trim options can be incorporated to manage high pressure drops, erosion, flashing, and other severe operating conditions while maintaining responsive process control.

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Technical Specifications

Parameter	Specification
Valve Type	High Temperature Globe Control Valve
Actuator	Pneumatic Diaphragm Actuator
Size	DN25-DN500
Pressure Rating	PN16-PN420
Maximum Temperature	Up to 600℃
Body Material	WCB, WC6, WC9, CF8M
Trim Material	316SS, F6a, Stellite
Bonnet Type	Extended Cooling Fin Bonnet
Flow Characteristic	Linear / Equal Percentage
Leakage Class	ANSI Class IV-VI
Medium	High Temperature Steam, Oil, Gas
Application	Refinery, Power Generation, Petrochemical

Features & Benefits

High-Temperature Construction

Body, trim, packing, and sealing materials can be selected to withstand elevated process temperatures and thermal cycling.

Pneumatic Diaphragm Actuator

Provides stable, responsive stem movement for continuous modulation and automated process control.

Thermally Isolated Bonnet

Extended bonnet configurations help limit heat transfer to the packing and actuator, supporting seal integrity and actuator performance.

Precise Flow Regulation

Engineered plug and seat geometry enables controlled adjustment of process flow across the required operating range.

High Pressure-Drop Capability

Specialized trim can dissipate pressure energy progressively to handle demanding differential pressure conditions.

Anti-Cavitation & Anti-Flashing Options

Multi-stage or specially configured trim can reduce cavitation, flashing, vibration, and associated component damage.

Heat-Resistant Trim Options

Hardened or specialized alloy trim can be selected for high-temperature, erosive, and high-velocity services.

Fail-Safe Actuation

Pneumatic actuator arrangements can be configured for fail-open, fail-closed, or other safety positions according to process requirements.

Stable Performance Under Thermal Cycling

The valve construction accommodates temperature-related expansion and contraction to maintain consistent control characteristics.

Suitable for Severe Process Services

Ideal for superheated steam, hot gas, thermal oil, refinery processes, petrochemical systems, and other high-temperature control applications.

Testing Equipment

-196°C Cryogenic Liquid Nitrogen Test System

Simulates ultra-low-temperature operating conditions to verify valve sealing performance and reliability for cryogenic applications.

Brinell, Rockwell & Vickers Hardness Tester

Ensures material hardness meets international standards for strength, durability, and long-term performance.

Large-Scale Coordinate Measuring Machine (CMM)

Provides high-precision dimensional inspection to ensure machining accuracy and product consistency.

Valve Life Cycle Testing System

Evaluates valve durability and operational reliability through repeated opening and closing cycle tests.

High & Low Temperature Test Chamber

Verifies valve performance and stability under extreme temperature conditions.

High Temperature Aging Test Chamber

Assesses long-term material stability and product reliability under continuous high-temperature exposure.

Desktop SPECTRO Optical Emission Spectrometer (Germany)

Performs rapid and accurate material composition analysis to ensure full material traceability and compliance.

Certification and Testing

Our engineering team evaluates these factors to ensure long-term reliability and regulatory compliance.

ISO9001:2015

Environmental Management System Certification

Occupational Health & Safety Management System Certification

Certificate of Quality System Approval

ScheduleTo Certificate No HPiVS-iP1001-062-Q-10-00

CEPTUфNKAT COOTBETCTBNа

EAC

Certificate of Authority to use the Official APl Monogram

ISO 15848－1 QUALIFICATION CERTIFICATE

Test Report

FAQ

Q What is a control valve used for?

Control valves automatically regulate flow, pressure, temperature, and liquid level to maintain stable and efficient process operation.

Q How does a control valve work?

A control valve receives signals from a controller and adjusts the valve opening through an actuator to achieve the required process conditions.

Q What actuator types are available?

Control valves can be equipped with pneumatic, electric, or hydraulic actuators, depending on the application requirements.

Q How do I select the right control valve?

Valve selection depends on process media, flow rate, pressure, temperature, valve size, and the required control accuracy.

Q What is the difference between a control valve and an on/off valve?

An on/off valve is designed for isolation, while a control valve continuously modulates flow to maintain precise process parameters.

Q Which industries commonly use control valves?

Control valves are widely used in chemical processing, oil & gas, LNG, power generation, pharmaceutical manufacturing, food processing, and industrial automation systems.