Derex, Inc.

DFT: Control Valves:

HI-100™ Severe Service Control Valve

DFT HI-100™ Severe Service Control Valve
  • The HI-100™ features an in-line straight-thru, Venturi flow design.
  • The seating element is positioned by its cage relative to the downstream seat by means of linear stem travel.
  • The Quick Change Trim feature permits in-line replacement of the internal trim.
  • Interchangeability of the upstream and downstream seats and wear bushings extends the life of the valve at no extra cost.
Product Specifications
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DFT Valve
DFT Certification
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The HI-100 Control Valve features an in-line straight-thru venturi flow design.

The control element, a spherical ball, is contained by a cage that positions it relative to the downstream seat by means of linear stem travel.

There are no close clearances between the moving parts (i.e. cage, ball and seat).These features enable the valve to operate smoothly and efficiently at high or low temperatures and/or in fluids carrying suspended particles such as slurries.

The Quick Change Trim feature permits in-line replacement of the internal trim (ball, stem, cage, seats, seat retainer cartridge and wear bushings).

Interchangeability of the upstream and downstream seats and wear bushings extends the life of the valve at no extra cost.

Class V shutoff is standard.

HI-100 Maximum Valve Flow Coefficient
Size NPS1/43/81/23/411-1/41-1/2
Size DN8101520253240
Cv (Kv)1 (0.9)2.5 (2.2)4.5 (3.9)10 (8.6)20 (17)31 (27)45 (39)
Size NPS22-1/23468 
Size DN506580100150200
Cv (Kv)80 (69)125 (108)180 (155)320 (275)720 (621)1280 (1103)
DFT Hi 100 Control Valve
HI-100 Face to Face Dimensions
Nominal Valve SizeANSI Class 150ANSI Class 300ANSI Class 600ANSI Class 900ANSI Class 1500ANSI Class 2500
DFT Hi 100 Control ValveClosed Position:
In the closed position, the ball is compressed into the conical seating surface by system pressure. Line contact between the ball and the seat loads the seating surface producing tight closure. As pressure increases, the seat load increases and the seal improves. During each valve stroke, the ball rotates and repositions itself presenting a new sealing surface to the seat, prolonging the tight shutoff capability. Temperature changes do not affect the tight shutoff since there is freedom of movement between the ball and the seat. The ball cannot become wedged into the seat. The guide pin is used to set the valve position, but has no function during normal operations.
DFT Hi 100 Control ValveFull Open Position:
In the full open position a straight-thru flowpath exists and the valve operates with the inherently high flow capacity of a venturi. The ball is mechanically held out of the flow stream by four inclined pads on the cage which oppose the pressure differential force. The Bernoulli effect moves the suspended particles towards the center of the fluid stream, preventing them from settling out into the body. This keeps the valve clean and free of material deposits in all positions during the valve stroke.
DFT Hi 100 Control ValveClose Throttling Position:
As the valve opens, it operates in the close throttling position. In this position, the ball is supported by the two forward inclined pads on the cage and the seat surface which oppose the pressure differential force caused by the Bernoulli effect. The ball is supported and stable throughout the valve stroke and does not pinwheel or chatter.
DFT Hi 100 Control ValveIntermediate Throttling Position
In the intermediate throttling position, the ball rests on the four cage pads and is opposed by the same differential pressure force. The stable suspension of the ball throughout the valve stroke permits extremely close and repeatable control throughout the entire valve stroke.
Energy per unit volume at inlet = Energy per unit volume at outlet
DFT Hi 100 Control Valve
The best example of the Bernoulli Principle is often called the Bernoulli Effect which states that fluid pressure decreases as fluid velocity increases.
DFT Hi 100 Control ValveThe illustration shows the typical change in pressure as the fluid moves through the valve. At inlet, the pressure is P1. Velocity increases through the valve to a maximum as it moves through the valve port. At the valve port, the pressure drops to Pvc (pressure at the vena contracta), which is the lowest pressure in the valve. As the fluid exits the valve, pressure recovers to P2 which is lower than P1.
DFT Hi 100 Control ValveCavitation Control
At P1 the fluid stream is all liquid. Liquid flashes at the valve port when the pressure at the vena contracta (PVC) drops below the liquid vapor pressure. As the velocity decreases in the exit nozzle, the pressure increases (or recovers) to P2 and the vapor bubbles collapse. This is known as the potentially damaging phenomena called cavitation. Unlike tortuous path valves, our control valves manage cavitation. Bubbles form at the lowest pressure (highest velocity) which is at the center of the fluid stream. The subsequent collapse is within the hydraulic barrier, not on metal surfaces. Our nozzle design provides a smooth recovery prior to the fluid exiting the valve.

Codes and Standards:

ANSI B16.5
Pipe Flanges & Flanged Fittings
ANSI B16.10
Face to Face & End to End Dimensions of Valves
ANSI B16.34
Valves – Flanged, Threaded & Welding Ends
Control Valve Seat Leakage – HI-100® & Ultra-Trol® seat test
ANSI/ISA 75.01
Flow Equations for Sizing Control Valves
ANSI/ISA 75.08.01
Face-to-Face Dimensions for Flanged Globe-Style Control Valve Bodies - LSV-100™
API 598
Valve Inspection & Testing – Uniflo® seat test
Standard Marking System for Valves, Fittings, Flanges & Unions
DFT Hi 100 Control Valve
Straight-thru Design solves your performance problems
Eliminates Damage: Our unique nozzle design smooths turbulence which eliminates body, trim and piping damage caused by high velocity fluid impingement in your system.
Handles Greater Flow: Since we have no tortuous path through our valve, our valves have a higher Cv than that of the same size valve made by competitors, often saving you money.
Precision Modulation & Control: Our 200:1 turndown ratio and linear flow characteristic gives you precise control over the entire operating range.

Unique Trim Design lowers your cost of ownership
In-Line Repair: All styles can be repaired in-line without the need for expensive special tools saving you time and money.
Long Life: Our trim design uses wear components at the critical places along the flow path maximizing design life for the application.
Low Replacement Costs: Our unique ball, cage and wear bushing design allows you the flexibility to replace only the worn parts, lowering your cost of repair significantly when compared to our competition.

Wide Application Range can be used in nearly any service
ANSI 150 to 4500: Handles all ANSI applications, pressures up to 16,000psi and temperatures from -425°F to 1900°F.
Liquid, Gas, Steam, Slurry: Our non-tortuous path design handles liquids, gases, steam (including mixed phase flow), abrasives and many slurry applications.
Materials: Standard body materials are Carbon, Alloy and Stainless Steel. High nickel and exotic alloys are also available – any weld-able alloy that is available as a forged material can be used.

Venturi Nozzle Design reduces turbulence in your piping system
Cavitation Control:Our nozzle design controls cavitation and reduces the associated noise and vibration.
Particulate and Mixed Phase Flow: Our nozzle design moves particles and water droplets to the middle of the flowstream avoiding costly damage.
Prevents Erosion: Our nozzle design smooths the flow and reduces the potential for valve body and pipe erosion.


Heavy Oil Upgrading
Drum Level Control

Abrasive Slurry Control
Amine Service

Gas Plant Pigging
Pipeline Control

Pulp & Paper
Steam Control


Fuel Oil
High Pressure Water with fines
Methane Vapor

Abrasive Slurry Control
Hot Hydrogen Gas
Pitch Blend Control
Powerhouse Applications
Super Critical Water Oxidation

Military Test
Nitrogen Gas
High Pressure Water

Bottom Ash
Condensate Drain
Drum Emergency Blowdown
Drum Level Control
Feedwater Control
Feedwater Recirculation
Fuel Oil Control
Geothermal Water Injection
Power Operated Relief
Soot Blower Control
Spray Control
Steam PRV
Thermal Drain
Turbine Bypass
Turbine Steam Extraction
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