In industrial process systems, safe and precise control of liquids and gases is essential for reliable operation. Instrumentation lines, pressure measurement points, differential pressure applications and flow control systems require valves that can withstand demanding process conditions while providing stable isolation, venting and equalization functions.
The ELX Needle Valve Series is designed for process control, instrumentation and flow control applications. Developed especially for corrosive and dangerous environments, the series offers complete stainless steel construction, welded single-piece body design, high pressure resistance and high temperature capability.
What Is the ELX Needle Valve Series?
The ELX Needle Valve Series is a group of stainless steel valves used to control, isolate, drain, vent or equalize liquid and gas lines in industrial measurement systems.
The product range includes models such as ELX-FF, ELX-MF, ELX-2FF, ELX-2MF, ELX-3FF, ELX-3FF-H, ELX-5FF and ELX-5FF-H. These versions include two-way, three-way and five-way valve configurations for different instrumentation and process requirements.
The valves are designed for high efficiency, high quality and low-cost use in various liquid and gas control systems.
Designed for Corrosive and Dangerous Environments
Industrial instrumentation valves may be exposed to corrosive chemicals, high-pressure gases, steam, hot liquids or hazardous process fluids. In these environments, valve body material and sealing design are critical for safety and long service life.
The ELX Needle Valve Series uses SS 316 stainless steel for the main body components, including body, bonnet and gland nut. This provides strong resistance in demanding industrial service conditions.
The spindle tip is made from 17-4 PH, while packing is Teflon. Depending on the bonnet configuration, Viton O-rings and additional stainless steel components are also used.
Key Advantages
The ELX Needle Valve Series offers several important advantages for industrial users. The catalog highlights complete stainless steel construction, weldless single-piece body structure, maximum pressure capability up to 690 bar and maximum temperature capability up to 400 °C.
These features make the series suitable for demanding process control and instrumentation applications where mechanical strength, sealing reliability and corrosion resistance are required.
Standards and Testing
The ELX Needle Valve Series is designed according to recognized industrial standards. The catalog lists ASME B16.34 for design and wall thickness.
Pipe thread standards include ASME B1.20.1, DIN 2999 / 259, ISO 228/1, JIS B 0203 and ISO 7/1.
Inspection and testing standards include MSS SP-110 and EN 12266. The test pressure is specified as 1.5 times the rated pressure.
These standards support reliable valve performance and suitability for industrial process applications.
Two-Way Needle Valves: ELX-FF and ELX-MF
The ELX two-way needle valve group includes ELX-FF and ELX-MF models.
The ELX-FF model has female-female connection configuration, while the ELX-MF model has male-female connection configuration. Both versions are available with G / NPT connection sizes from 1/8" to 2".
These valves are used for basic isolation and flow adjustment in instrumentation lines. They are suitable for pressure measurement points, impulse lines, sampling lines and general liquid or gas control applications.
Two-Way Block and Drain Valves
The ELX series also includes two-way block and drain valve configurations such as ELX-2FF, ELX-2MF-V and ELX-2FF-V.
These designs include a block valve and a drain valve, allowing the user to isolate the process side and safely release trapped pressure or fluid from the instrument side.
The catalog shows 2 x 1/2" NPT connection configurations, with instrument connection, process connection, block valve and drain valve clearly defined in the dimensional drawings.
These valves are practical for pressure instruments, transmitters and maintenance points where safe isolation and venting are required.
Three-Way Needle Valves: ELX-3FF and ELX-3FF-H
The three-way valve models are designed for applications requiring block, drain and equalizing functions in a compact manifold structure.
The series includes ELX-3FF single direction flanged type and ELX-3FF-H double direction flanged type.
Both models use 2 x 1/2" NPT input and 2 x 1/2" NPT output connections. The dimensional table lists C = 90 mm, C1 = 226 mm and D = 32 mm. The L dimension is 70 mm for ELX-3FF and 95 mm for ELX-3FF-H.
These models include an equalizer valve, drain valve and block valve, making them suitable for differential pressure measurement and transmitter manifold applications.
Five-Way Needle Valves: ELX-5FF, ELX-5FF-H and ELX-5FF-P
The five-way valve group is designed for more advanced differential pressure instrumentation applications. These valves provide block, equalizing, drain and vent functions in one compact assembly.
The series includes ELX-5FF, ELX-5FF-H and ELX-5FF-P models. ELX-5FF and ELX-5FF-H are double direction flanged models, while ELX-5FF-P is a straight body model.
All three models use 2 x 1/2" NPT input and 2 x 1/2" NPT output connections. The catalog lists D = 32 mm for all models. The C dimension is 98 mm for ELX-5FF and ELX-5FF-H, and 152 mm for ELX-5FF-P. The C1 dimension is 226 mm for ELX-5FF and ELX-5FF-H, and 276 mm for ELX-5FF-P. The L dimension is 85 mm, 110 mm and 84 mm, respectively.
These configurations are suitable for differential pressure transmitters and applications requiring accurate isolation, equalization, venting and draining.
Single and Double Bonnet Assemblies
The catalog shows two bonnet assembly types. Single bonnet assembly is used for 3/4" and above sizes, while double bonnet assembly is used for sizes up to 1/2".
The single bonnet assembly includes body, bonnet, gland nut, spindle tip, Teflon packing, stainless steel ring, stainless steel bush, stopper pin, stainless steel handle and grub screw.
The double bonnet assembly includes body, bonnet, adjustable bonnet, spindle tip, Teflon packing, Viton O-ring, check nut, stainless steel spindle, handle, grub screw, nylon dust cap and stopper pin.
These designs support reliable sealing and mechanical operation according to valve size and application requirement.
Material Construction
The main material used throughout the ELX Needle Valve Series is SS 316 stainless steel. This includes the body, bonnet, gland nut, steel rings, steel bush, check nut and spindle where applicable.
The spindle tip is made from 17-4 PH, which supports durability at the sealing point. The packing material is Teflon, providing chemical resistance and sealing stability. The dust cap is nylon in double bonnet designs.
This material structure makes the series suitable for industrial fluids and gases in corrosive or demanding environments.
Connection and Dimensional Flexibility
The ELX needle valve series provides G / NPT connection options and multiple dimensional configurations. Two-way valves are available from 1/8" to 2" connection sizes, with different orifice and Cv values depending on size.
For example, ELX-FF and ELX-MF models range from 3 mm orifice / Cv 0.24 at 1/8" size to 14 mm orifice / Cv 3.1 at 2" size.
This allows users to select the correct valve size according to required flow capacity, connection standard and installation space.
Typical Application Areas
The ELX Needle Valve Series can be used in process control systems, instrumentation lines, pressure measurement systems, differential pressure transmitter manifolds, sampling lines and general flow control applications.
It is suitable for liquid and gas systems where precise manual flow adjustment, safe isolation or controlled venting is required.
Typical sectors include chemical processing, oil and gas, petrochemical plants, power generation, water and wastewater systems, steam systems and general industrial automation.
Why Choose the ELX Needle Valve Series?
The ELX Needle Valve Series is a strong choice for users who need robust instrumentation valves for demanding process conditions.
Its stainless steel construction, high pressure and temperature capability, weldless single-piece body design, multiple valve configurations and compliance with industrial standards make it suitable for a wide range of industrial control and measurement applications.
The availability of two-way, three-way and five-way configurations allows the same product family to cover simple isolation, block and bleed, equalizing and differential pressure transmitter manifold requirements.
Conclusion
The ELX Needle Valve Series provides durable and reliable valve solutions for process control, instrumentation and flow control applications. Designed for corrosive and dangerous environments, the series combines SS 316 stainless steel construction, Teflon packing, high-pressure capability up to 690 bar and high-temperature operation up to 400 °C.
With two-way, three-way and five-way models, G / NPT connection options and tested design standards, ELX needle valves offer practical and dependable performance for industrial liquid and gas control systems.