Brand: Flowserve

Valtek Mark One Globe Control Valve

Name: Valtek Mark One Globe Control Valve – Datasheet & Quote
Brand: Flowserve

Description

Overview

The Valtek Mark One globe control valve offers superior performance in liquid and gaseous services, while also permitting easy, fast, and inexpensive maintenance without pulling the entire valve body. The spring-cylinder actuated Mark One valve provides stiffness and maintains high positioning accuracy, repeatability, controlled high speed, and faithful response across a wide range of operating conditions, making it the industry choice for a simple, reliable, tough globe valve that maintenance teams can service quickly without specialized tooling, minimizing valve downtime during a planned turnaround.

As a trusted supplier of Flowserve valve solutions, Seven Star LLC proudly offers the Valtek Mark One to power generation, chemical processing, oil and gas, and general industrial applications across the Sultanate of Oman, Muscat, and the wider GCC. Available in globe, angle, and three-way body styles, it delivers a broad solutions envelope with significant flexibility for a wide range of process control applications, letting a plant standardize spare parts across several valve configurations.

Measurement Principle

The Mark One valve handles up to 150 psig (10.3 barg) supply air and has the thrust to shut off against much higher fluid pressures. It is designed so that the spring, supply air pressure, and fluid pressure itself combine to produce an exceptionally tight shutoff, with a self-aligning seat ring further enhancing shutoff capability across repeated open-close cycles.

The Mark One valve is typically double top-stem guided and completely avoids contact between the plug and seat retainer—many globe valve maintenance problems can be traced to cage-guiding, where close metal-to-metal contact between the cage and plug often results in galling and sticking. Globe-style bodies feature smooth, streamlined, constant-area internal passages with no pockets, permitting high capacity with minimum turbulence, while nearly constant wall thickness provides lower weight and cost when manufactured in expensive stainless or alloy steels, an important consideration for high-alloy trim on corrosive service.

Engineering Design of the Valtek Mark One

The Mark One is available in size ranges from 0.5 to 36 inches and pressure classes from 150 to 4500, with seating materials including 300 series and 400 series stainless steel, Alloy 6 and 21 overlay, Monel, Hastelloy, Inconel, PTFE soft seat, and other special alloys. The clamped-in seat and top-entry trim permit easy, quick maintenance, and with the Mark One valve’s high degree of parts interchangeability, fewer inventory parts are required across the range.

The cylinder actuator is lighter, smaller, and easier to handle than comparable diaphragm actuators, while severe service trim options such as MegaStream and Stealth address noise abatement, and CavControl, ChannelStream, DiamondBack, and SideWinder address cavitation control. The valve is compatible with Logix digital positioners for advanced digital control and diagnostics, and can be configured for globe, angle, or three-way (combining/diverting) service depending on the process routing required.

Key Features

The Valtek Mark One combines a proven cylinder-actuated globe design with extensive configurability. Core capabilities include:

Small, compact, lightweight body and actuator package.
Stiff, high-thrust cylinder actuator for position accuracy, repeatability, and assured response.
Size range 0.5 to 36 inches; pressure class 150 to 4500.
Double top-stem guided design eliminates cage-guiding galling and sticking issues.
Clamped-in seat and top-entry trim for fast, inexpensive maintenance.
Severe service options for noise abatement (MegaStream, Stealth) and cavitation control (DiamondBack, SideWinder).
SIL certified with ATEX, IECEx, CRN, and CE approvals.
Compatible with Logix digital positioners for advanced control.

Industrial Applications

The Valtek Mark One is well suited to power generation, chemical processing, oil and gas, and general industrial facilities across Oman requiring reliable, high-accuracy control of liquid and gaseous process streams. Its broad configuration options and severe-service trims make it dependable for demanding applications including nuclear, combined cycle, and concentrated solar power installations throughout the region.

Technical Specifications

Full technical parameters for the Valtek Mark One globe control valve:

Parameter	Specification
Model	Valtek Mark One
Body Style	Globe, Angle, Three-Way
Size Range	0.5 to 36 in
Pressure Class Range	150 to 4500
Actuation	Spring-Cylinder
Supply Air Pressure	Up to 150 psig (10.3 barg)
Seating Material	300/400 Series SS, Alloy 6/21, Monel, Hastelloy, Inconel, PTFE
Guiding	Double Top-Stem Guided
Certifications	ISO 9001, SIL, ATEX, IECEx, CRN, CE

Why Choose Seven Star LLC for Control Valve Sourcing

Specifying a globe control valve correctly means matching trim type, seating material, and severe-service options (noise abatement or cavitation control) to the actual process conditions – a valve that looks correct on paper can still suffer premature wear or fail to control accurately if the trim doesn’t match the real pressure drop and fluid behavior at the specific control point. Seven Star LLC’s engineers review the process conditions (pressure drop, fluid type, noise or cavitation risk) with the customer before the Mark One is ordered, confirming size, pressure class, and trim selection against the actual duty rather than a generic globe valve specification. We also help plan spare trim kits given the valve’s top-entry, clamped-in seat design, and coordinate delivery around planned turnarounds at power generation and chemical processing facilities across Muscat, Sohar, and the wider GCC.

Request a Quote for Valtek Mark One Globe Control Valve

To submit a formal Request for Quote (RFQ), check current availability and lead time, or arrange technical consultation for the Valtek Mark One Globe Control Valve, please contact the instrumentation division at Seven Star LLC today. As a trusted supplier of Flowserve valve solutions in Oman and the GCC, our engineers are ready to assist with rapid sourcing for your process control valve projects.

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About brand

Flowserve is the American flow control company for pumps, valves, mechanical seals and valve automation, known through brands such as Durco, Worthington, Byron Jackson, Valtek, Limitorque, Worcester, Logix and Argus. It was formed on 22 July 1997 by the merger of equals of Durco International and BW/IP, whose heritage reaches back to Simpson & Thompson (1790) and Byron Jackson (1872). Flowserve Corporation is headquartered in Irving, Texas, and listed on the New York Stock Exchange.

Seven Star LLC sources and supplies Flowserve pumps, seals, control valves, ball valves, actuators and positioners for process plants in Oman, working from the nameplate data and the manufacturer's documentation.

Flowserve company profile

Formed	22 July 1997, merger of Durco International and BW/IP
Heritage companies	Simpson & Thompson, later Worthington Simpson (1790); Byron Jackson (1872); Duriron foundry, later Durco (1912)
Headquarters	Irving, Texas, USA
Ownership	Flowserve Corporation, public company (NYSE: FLS)
Product families	API and ANSI process pumps, Durco and Worcester ball and plug valves, Durco TX3 triple-offset and Valtek butterfly and globe control valves, Limitorque electric actuators, Logix positioners, mechanical seals

Milestones

1790: Thomas Simpson founds Simpson & Thompson, a predecessor of Worthington Simpson pumps.
1872: Byron Jackson is founded, a root of BW/IP.
1912: The Duriron foundry, later Durco, is launched.
1997: Durco International and BW/IP merge on 22 July to form Flowserve, listed on the NYSE as FLS.

Flowserve product families listed here

Flowserve pumps on this page are the Durco Mark 3 ANSI process pump and the ECPJ vertical sump pump built to API 610 type VS4. Sealing products are the ISC2 cartridge mechanical seal to API 682 and DuraClear barrier fluid for dual seal systems. Flowserve valves include the Valtek Mark One globe control valve, Argus floating and trunnion-mounted ball valves (EK71, FK79, FK76M) and Durco Microfinish ball valves. Automation is covered by Limitorque MX and L120 multi-turn electric actuators, the Rotadisk RD and RDF pneumatic actuator and the Logix 3800 digital positioner.

Where Flowserve equipment is used

Mark 3 pumps handle acids, caustic, solvents and utilities in chemical and petrochemical units. VS4 sump pumps drain pits and collection tanks. Valtek control valves and Argus ball valves are found in refining, gas processing, power and desalination, and Limitorque actuators operate gate and globe valves on pipelines, tank farms and water networks across the GCC.

Flowserve products we list

Family	Examples
Ball Valves	Argus EK71 End-Entry Floating Ball Valve, Argus FK76M Trunnion Mounted Ball Valve, Argus FK79 Floating Ball Valve, Durco Microfinish Ball Valves, Worcester Series 44 Three-Piece Ball Valve
Pumps	DS-4614-5-F DuraClear Barrier Fluid, Durco Mark 3 ANSI Process Pump, ECPJ 25-200-R API 610 VS4 Vertical Sump Pump, ISC2 API 682 Cartridge Mechanical Seal
Control Valves	Valtek Mark 100 Ultra-Capacity Globe Control, Valtek MaxFlo 4 Eccentric Rotary Plug Control, Valtek Valdisk High-Performance Butterfly, Valtek Mark One Globe Control Valve
Valve Actuators	Limitorque L120 Multi-Turn Electric Actuator, Rotadisk RD and RDF Pneumatic Actuator, Limitorque MX Multi-Turn Actuator
Butterfly Valves	Durco TX3 Triple Offset Butterfly Valve
Valve Positioners	Logix 3800 Digital Positioner

Ordering Flowserve parts: what we need

The serial number on the nameplate is the key to Flowserve records for a pump, valve or actuator. Please add the following by product type:

Pumps: size and model, impeller diameter, materials, seal arrangement, and the part name and item number from the sectional drawing
Mechanical seals: seal type and size, drawing or part number, materials code, pumped fluid and flush plan
Valves: size, pressure class, body and trim materials, end connections, and the actuator and positioner model
Limitorque actuators: unit size, order and serial number, supply voltage, wiring diagram number

Facts checked against Flowserve's SEC filings and published company histories, October 2026.

Browse Flowserve products by category: Control Valves, Pumps, Valve Actuator, Valve Positioner.

FAQ

Questions about the Valtek Mark One Globe Control Valve

Answers from our engineering team on installation, compatibility and integration.

01What sizes and pressure classes does the Valtek Mark One cover?

It is available in sizes from 0.5 to 36 inches, across pressure classes from 150 to 4500.

02What body styles are available for the Mark One?

It is available in globe, angle, and three-way configurations, with three-way used for combining or diverting service.

03Why is double top-stem guiding beneficial?

It completely avoids contact between the plug and seat retainer, eliminating the galling and sticking problems common with cage-guided valve designs.

04Is the Mark One compatible with digital positioners?

Yes. It is compatible with Flowserve Logix digital positioners for advanced digital control and diagnostics.

05How do I request a quotation for Valtek Mark One Globe Control Valve?

Send the model number, required quantity and delivery location through the quote request form or by email to Seven Star LLC. The sales team replies with availability, lead time and commercial terms for your Oman or GCC project.