Pneumatic Diaphragm Forged High Temperature Control Valve

Engineered for severe high-temperature and high-pressure process conditions, the Pneumatic Diaphragm Forged High Temperature Control Valve combines a forged pressure-retaining body with a pneumatic diaphragm actuator to deliver precise and stable flow regulation. The forged construction provides enhanced strength and resistance to thermal and mechanical stresses, while the extended bonnet and heat-resistant trim help protect the packing system and maintain control performance at elevated temperatures.

The valve is particularly suitable for superheated steam, high-temperature gas, thermal oil, petrochemical, refinery, and power generation applications. Its compact forged construction and application-specific trim options make it well suited for demanding services involving high differential pressure, erosion, cavitation, or thermal cycling, where dependable modulation and pressure containment are critical.

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Technical Specifications

Parameter	Specification
Valve Type	Forged Globe Control Valve
Body Construction	Fully Forged Body
Actuator	Pneumatic Diaphragm Actuator
Size Range	DN15-DN300
Pressure Rating	Class 600-Class 2500
Body Material	Forged F11, F22, F91, SS316
Temperature Range	-196℃~650℃
Trim Material	Hardened Stainless Steel / Stellite
Bonnet Type	Extended Bonnet
Leakage Class	ANSI Class V-VI
Connection	Socket Weld / Butt Weld / Flanged
Application	Steam System, Thermal Power, Refinery

Features & Benefits

Forged Pressure Boundary

The forged body provides high structural strength and resistance to pressure, thermal shock, and mechanical loading.

High-Temperature Trim

Heat-resistant and hardened trim options can be selected to withstand elevated temperatures, high velocities, and erosive process conditions.

Pneumatic Diaphragm Actuation

Delivers responsive and repeatable stem movement for continuous automatic flow regulation.

Extended Bonnet Configuration

Helps create a thermal buffer between the hot process medium and the packing and actuator components.

Precise Modulation

Engineered plug and seat profiles provide controlled flow adjustment and predictable process response.

High Differential Pressure Handling

Multi-stage or pressure-balancing trim can be incorporated to manage severe pressure drops and reduce excessive fluid energy.

Anti-Cavitation & Anti-Erosion Options

Specialized internal configurations help limit cavitation, flashing, erosion, vibration, and noise in challenging services.

Thermal Cycling Resistance

Forged construction and carefully selected sealing components help accommodate repeated heating and cooling cycles.

Fail-Safe Operation

The pneumatic actuator can be configured for fail-open, fail-closed, or other predefined safety positions.

Suitable for High-Energy Applications

Ideal for main and auxiliary steam, superheated steam, high-temperature gas, thermal oil, refinery, petrochemical, and power plant process systems.

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.