Control Valves
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SchuF Fetterolf Control Valves R E G E LV E N T I L E

Control Valves Control valves work to keep a process variable such as flow or pressure within a predefined operating range. They are often the last piece of equipment in a process loop that can compensate a load disturbance and are therefore considered critical valves. Custom Applications SchuF’s experienced design engineers provide you with unique valve designs to meet both usual and unusual process demands. Special application designs, in service worldwide and showing continuous satisfactory performance, include:  Discharge and feed flow control valve in PET, PVC, PP & PE reactors Level,...

Key Angle Control Valve Features:  Accelerating Flow Path: Acceleration of abrasive process media is maintained continuously through a sweeping, non-expanding angle body to prevent flashing until the fluid, gas or slurry enters the protected outlet area. There is no stagnant space where process slurry can form eddies or undesired turbulence. In-Line Control Valves  –  Model 50R The Y-globe control valve can be installed in process lines from 1 inch to 24 inches and is ideal to control flow or to reduce pressure. It has a sturdy design, superior flow and control characteristics (compared to...

Angle Control Valves The SchuF control valve product range consists of angle as well as in-line control valves. SchuF has developed over 20,000 control valve variations in its hundred year history. Each has its own specific characteristics tailored to the process control elements that are most important for it  –  pressure, level, flow or temperature. X-Flash – Model 74BS Ideal for avoiding flashing in the valve  Flow to open  –  External Flashing  Single stage letdown design  High Cv values (1 to 3000)  Low wear and tear  Disc opening direction eliminates plugging by sediments  Best...

Common SchuF Angle and In-line Control Valve Features:  Seat leakage to Class VI, API 598 or EN 60534-4  Linear, equal % and SchuF bell X 3 control curve Standard robust yoke construction  Integral plug and stem  Accelerating body geometry design  Optimised 3 phase flow calculation Multi-S – Model 74M Ideal to let down high pressure over several stages and avoid cavitation  2, 3 or up to 6 staged pressure reduction disc design  Up to ASME 2500# as standard  True Equal % characteristics  High Cv values (1 to 3000)  Large outlet chamber to reduce velocities  Disc opening direction...

In-Line Control Valves Y-Globe Control Valve  –  Model 50 Ideal for in-line control with bubble tight positive shut-off  High throughput (e. g. 4“ (DN 100)  –  Cv min 140 to max 300)  Flow optimised  –  low pressure drop  Equal %, linear or custom control characteristics  Class VI process shut-off and zero leakage to atmosphere performance  Dead and slow space free options Wafer Control Valve  –  Model 76 Ideal for limited space control applications  Space saving design  Cost optimised  Linear or equal %  1/ 2 inch to 3 inch  To ASME 2500# Globe Control Valve  –  Model 72 Ideal...

Control Valves Control Valve Flashing Solutions Control valves used in applications involving liquids in high pressure or high pressure drop conditions are highly susceptible to damage from flashing or cavitation. Flashing occurs in the liquid flow when the internal pressure of the liquid falls below the vapour pressure and remains below it. During this phase vapour bubbles form and flow with the liquid downstream at increased velocities causing erosion to valves and piping. Whilst the variables (P 2 and Pv  –  see above diagram) that define flashing are not directly controlled by the...

Control Valves Cavitation Cavitation occurs in a similar way to flashing with the formation of gas bubbles as the liquid pressure falls below vapour pressure. If the liquid pressure then recovers and rises above the vapour pressure the bubbles start to collapse or implode creating a shock wave which releases energy in the form of multiple micro jets. Three stage control plug example Micro jets have a velocity of 400 km per hour and temperatures of up to 5,500 ° C and literally blast away pieces of the valves components or lead to severe pitting and accelerated corrosion. Cavitation is...

Automatic Recirculation Valve (ARV)  –  Model 78 Automatic recirculation valves have the primary purpose of protecting centrifugal pumps by assuring minimum flow through the pump at all times. Key Features:  Standard sizes up to 16” (DN 400) and ASME 4500#  Automatic bypass operation They replace conventional multi valve pump protection solutions which have proven to be costly or inefficient. The automatic recirculation valve approach unites the check valve, the automatic bypass control valve and pressure letdown functionality in a single valve body.  Modular design  Custom pressure...

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