Control Valves

DFT®’s top-of-the-line control valves feature a straight-thru design, allowing for an unobstructed flow with no abrupt changes in the flow path.

A few key features of these control valves are listed below.

High rangeability — up to 200:1 turndown ratio
Unique “internal” design
High-flow capacity
In-line repair possible
Class V shutoff
Linear flow properties
Meets ANSI classes 150 to 4500
Various material options: carbon steel, alloys, stainless, and others
Low cost of ownership, allowing for easy interchangeability
Can handle liquids, gases, vapors, slurries, and abrasive materials
Actuation options: manual, pneumatic, electric, and hydraulic
Accessories available: airsets, limit switches, manual override, positioners, etc.

To learn more, watch our educational control valve video, or sign up to receive monthly control valve tips delivered to your inbox.

Control Valve Product Offerings

HI-100® Control Valves

Our HI-100® model is a severe-service control valve featuring an in-line, straight-thru, Venturi-flow design. The seating 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).

Plus, the interchangeability of the upstream and downstream seats and wear bushings extends the life of the valve — at no extra cost. This control valve model is composed of carbon, alloy, and stainless steel, as well as high alloys, and functions between temperatures of -425 ºF and 1900 ºF.

The HI-100® meets ANSI standards 150 to 4500. The valve may be completed with a weld, flanged, or custom end prep, and has low operating thrust. HI-100® may be used for manual, pneumatic, electric, and hydraulic actuation, and utilizes top or bottom entry.

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ULTRA-TROL® Control Valves

The ULTRA-TROL® is a flanged abrasive-service control valve designed for lined pipe applications requiring flanged end connections. The internal design features are similar to those of the HI-100® model, and include the in-line through-ported Venturi flow shape and contained spherical ball.

These basic features enable the valve to operate smoothly and efficiently at high or low temperatures, as well as in slurries. The ball, cage, and stem can be easily replaced in-line without removing the valve, and the downstream seat is end loaded for quick replacement. This model can effectively operate between ‑425 ºF and 1000 ºF, and has a flanged end that can be ANSI, DIN, or JIS.

These valves are made of alloy, carbon, and stainless steel, and other high alloys. ULTRA-TROL® valves offer top or bottom entry and have low operating thrust. ULTRA-TROL® may be used for manual, pneumatic, electric, and hydraulic actuation. This model meets ANSI standards 150 to 2500.

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LSV-100® Control Valves

The LSV-100® is an economical control valve for use in top entry, flanged applications. The trim of this valve is replaceable in the field through the bonnet. These valves are constructed of carbon or alloy steel, with stainless steel internals. Other materials of construction are available upon request.

LSV-100® may be used for modulating control or for on/off gas, liquid, and steam applications. This model adheres to Class IV shutoff standards in ANSI class 150 and 300.

The LSV-100® offers top-guided, unbalanced, and single-seat trim. Equal-percentage, linear, and quick-opening trim is available for pressure drops up to 600 psi in non-cavitating environments. Our LSV-100® valves are the most cost-efficient option for standard control applications.

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Our Control Valve Advantage

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open

Control Valve Design

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closed Closed Position
In the closed position, pressure moves the ball into the conical seating surface and holds it in place. Line contact between the ball and the seat results in high surface loads between the seat and the ball, allowing for tight closure. As pressure increases, the seat load increases, improving the seal. During each valve stroke, the ball rotates and repositions itself, presenting a new sealing surface to the seat and 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; during normal operation, the pin has no function.

open Full Open Position
In the full open position, a straight-thru flow path exists, and the valve operates with the inherently high-flow capacity of a Venturi. The ball is firmly held out of the flow stream by four inclined pads on the cage that oppose the pressure differential force. The Bernoulli pressure differential moves the suspended particles toward 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.

Close 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 that 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.

Intermediate 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, repeatable control throughout the entire valve stroke.

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