With their flexible, modular design, our SAMSON control valves can be tailored to the specific control task, which allows them to meet even the most challenging requirements under severe operating conditions.
SAMSON can supply modular control valves with globe, angle and three-way bodies in all common pressure ratings and materials at short notice. The valves are designed in accordance with the ANSI, DIN or JIS standards and available with different flange types and welding ends.
We have all common valve body styles and end connections in our product range, which can be combined in almost any way thanks to their modular design. No matter whether you are looking for a globe valve with screwed ends, a three-way valve with flanges or an angle valve with welding ends, SAMSON can supply you with the right valve body in the highest quality to meet your requirements.
The valves are available in a wide range of materials. To deliver the highest quality, the valve bodies are subjected to extensive inspection and testing before the valves are assembled. We perform inspections and tests depending on the valve material. The results are documented in a test report or inspection certificate depending on customer specifications.
The targeted valve leakage depends on the plant requirements and the process medium used. Reducing leakage is not only relevant to hazardous substances. It applies to all media. While seat leakage is decisive to the proper functioning of the process, the control of fugitive emissions at the packing, bellows and flange is stipulated in various standards and regulations to reduce emissions and protect the environment.
The packings meet the fugitive emission requirements according to VDI 2440 and, as a result, fulfill the requirements of TA Luft (German technical instructions on air quality control). SAMSON's ISO packings are tested based on EN ISO 15848 and comply with the external leakage rates depending on the temperature, load and pressure even in continuous operation. The ANSI/FCI 91-1 standard and EPA (Environmental Protection Agency) specifications apply to ANSI valve versions.
Features
V-port plugs have three V-shaped ports. Their size varies depending on the valve size. The process medium in the valve flows through the V-shaped ports as soon as the plug is lifted out of the seat (i.e. the valve opens).
Flow dividers shorten the free jet exiting the vena contracta and accelerate the energy transfer in the mixing zone. As a result, noise emissions are reduced when handling gases and vapors.
See data sheet for further details
T 8081 EN: Flow Dividers for Control Valves
A single-stage letdown at differential pressures up to 250 bar can be achieved using the Zero Travel 1 (ZT-1) trim.
See data sheet for further details
T 8087 EN: Control Valves with Zero Travel 1 Trim
Perforated plugs are optimized to reduce noise levels. The process medium flows through the perforated plug and the jet stream is split into numerous smaller jets to ensure low-noise energy transfer to the surrounding medium.
See data sheet for further details
T 8086 EN: Valves with perforated plug
AC trims (AC-1, -2, -3 and -5) are optimized for the low-noise and low-wear pressure reduction of liquids. The AC trims ensure that the pressure is let down gradually across several throttling stages to prevent cavitation.
See data sheet for further details
T 8082 EN: Pneumatic Control Valves with AC-1 or AC-2 Trim
T 8083 EN: Pneumatic Control Valves with AC-3 or AC-5 Trim
The bonnet, which seals off the valve at the top, is used to mount the actuator or yoke. The standardized NAMUR rib located on the yoke allows easy, standardized attachment of a positioner or other valve accessories.
Series 240 (up to DN 150):
The bellows seal is installed in addition to the packing between the actuator and valve to seal off the plug stem.
The bellows seal also acts similar to an insulating section as it keeps the packing and actuator at a sufficient distance from the process medium to protect them against excessive temperatures.
The insulating section serves to keep the packing and actuator at a distance from the process medium.
Cryogenic valves:
SAMSON valves are preferably fitted with Type 3271 and Type 3277 Pneumatic Actuators, which have been proven in use over decades. Standardized interfaces (IEC 60534-6-1 and VDI/VDE 3847) as well as the direct attachment developed by SAMSON for Type 3277 Actuators allows actuators to be fitted with accessories, such as positioners, limit switches and solenoid valves. Through the modular design, the actuator and valve can be easily upgraded to achieve automated valves with short transit times suitable for use in safety-instrumented systems.
In the age of the Internet of Things, it is a matter of course that control valves are integrated into process control systems. Data on the control valve itself and diagnostic data are collected, saved, analyzed and transmitted to the process control system by digital field devices. Similarly, data can be forwarded from the process control system to the field devices. The field devices used in control valve engineering are usually positioners – in some cases also limit switches –, which are mounted on the control valve.
Positioners compare the set point issued by automation equipment (controller, control station, process control system) to the valve's position and supply the actuator with a corresponding output signal pressure (pst). SAMSON's digital positioners are also able to collect, analyze and transmit operating data.
SAMSON's EXPERTplus valve diagnostics can detect faults and provide predictive, status-oriented maintenance recommendations for valves with pneumatic actuators. The full scope of diagnostic functions is completely integrated into the positioner. The numerous diagnostic functions allow faults to be pinpointed in control and on/off valves at an early stage.
