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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.

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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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Our Control Valve Advantage

Closed & Locked Position diagram

Close Throttling Position diagram

Intermidiate throttling position blue diagram

open

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Control Valve Design

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Closed & Locked Position diagram 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 diagram 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.

Intermidiate throttling position blue diagram 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.

Featured Resources

Control Valve Catalog

Selecting the Right control Valve

Severe Service Control Valves

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Recent Blog Posts + See All

How to Select the Right Control Valve

Posted by Jeff Kane on March 4, 2021 3:58 pm

Control valves play a vital role in ensuring the efficiency of a fluid system. It is important to choose the one you use carefully. Otherwise, it may not operate or perform as expected, resulting in decreased process efficiency and/or system damage. There are many factors to consider when selecting a control valve for a fluid… Read More

Upcoming Webinar: Severe Service Control Valves – Problems & Solutions

Posted by Jeff Kane on May 6, 2019 1:17 pm

Maintaining the performance of your facility’s control valves will ensure continued successful operations for your organization. At DFT®, we know a thing or two about valves, and we’re excited to share our knowledge at our upcoming webinar about control valves on May 15, 2019 at 2:00 PM Eastern Standard Time. During the webinar, we will… Read More