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AFV - Axial Flow Valves

Control Seal developed the Axial Flow Valve (in short AFV) due to market demand for a compact Control Valve for critical control and safety systems.

Size: 3” ~ 48” (DN75 ~ DN1200) (~ 72” on request)

Bore: Reduced or Full (Full is not piggable)

Pressure: 150# ~ 2500# (PN20 ~ PN420)

Temperature range: -129°C ~ 260°C (550°C for fire safe)

Connections: Wide choice on request

Materials: Wide choice on request (also available in NACEMR0103 / NACEMR0175)

Axial flow valve


The Control Seal Axial Flow Valve has the following characteristics:


SMALL, compact and low weight design

STREAMLINED flow path egg shape BODY reducing pressure drop, less velocity and less turbulance, lower noise compared to conventional valves



PRESSURE BALANCED PISTON enabling fast stroking and low operating torque, leading to a SMALL ACTUATOR requirement

NON-SLAM operation

BI-DIRECTIONAL and BUBBLE TIGHT sealing both upstream or downstream of the valve.

FRICTION FREE between sealing areas, no need of partial stroke testing


VERTICAL or HORIZONTAL orientation possible without modification

RELIABLE DESIGN (often used for HIPPS applications, as Pressure Safety valve or Emergency Shutdown valve)



  • Control Seal ON / OFF Axial Flow Valve

  • Control Seal CONTROL Axial Flow Valve
  • Control Seal SURGE RELIEF Axial Flow Valve
  • Control Seal CHOKE Axial Flow Valve
  • Control Seal Axial Flow CHECK Valve

(Control Seal HIPPS Axial Flow Valve currently under development)



  • oil and gas production

  • process industries

  • transmission, distribution and storage of fluids

  • severe service compressor recycle solution

Used for wide range of fluids:

  • crude oil to refined products

  • water and seawater (water injection and deceleration)

  • natural gas (with contaminants such as sand)

Control Seal design


Control Seal has a unique design of its products, short lead time, competetive pricing and excellent after-sales support.


The Control Seal Axial Flow Valve has the following distinguishing features:

Quarter turn Stem Design

  • Eccentric disk connected to the rotating stem to move the piston rod practically frictionless, compared to a gear-rack which loses more than 50% of its thrust.

  • Compact actuator due to reduced friction of inside mechanism and balanced piston. Moreover the rotating actuator has a lower stem friction.

  • High-end stem packing design avoiding fugitive emissions along the stem.

  • Available in different trim characteristics - cage design (linear, equal percentage,  modified stage).

Sealing mechanism

  • Bubble tight shut-off to ANSI class VI, independent of actuation method. Fire safe shut-off to ANSI class V.

  • Option for dual sealing consisting of two independent mechanisms: a metal-to-metal seal in combination with special design soft seal.

  • No erosion impact on the seals and noise reduction. Soft seals not in contact with high flow due to special design concentric cage.

Fire Safe

  • Fire safe according to API 6FA. Internal leakage is avoided by metal-to-metal seal, whereas external leakage is contained by the graphite containing stuffing box on the rotating stem.

Split body design allowing shorter lead times

  • Optional cladding

Special trim for anti-surge application

  • Special design piston with no erosion during full throttling process fluid inside the sealing area

  • Reduced stroking time during overshoot set point input

Trim selection

  • AXF-FS - Fast Shut-off concentric Trim

  • AXF-CL - Single cage concentric linear Trim

  • AXF-CEQ - Single cage concentric eq% Trim

  • AXF-CCL-II - Double cage concentric linear Trim

  • AXF-CCEQ-II - Double cage concentric eq% Trim

  • AXF-CCW - Labyrinth cage concentric whisper Trim



API 6D, ASME B16.34

Face to Face dimensions

API 6D, ASME B16.10, B16.47


ASME B16.5, B16.25, BW, Grayloc hubs, API605 (B16.47)

Fire Safe

ISO 10497, API 6FA, BS 6755

Fugitive Emission

ISO 15848, TÜV, Shell MESC SPE 77-312


ANSI/FCI 70.2, API598




ISO 5211

Size selection

ANSI/ISA S75.01-2007 & IEC 60534-8-3:2010


AFV operation