Row triangle Shape Decorative svg added to top

Isolation Valves

IMG_2581 (1)

A new standard for
severe-service performance
and reliability

Efficient, Durable Severe-Service Isolation Valves

The Critical Flow Valves (CFV) isolation valve sets a new standard for reliability and performance in high-temperature, severe-service applications. Specifically designed for separation, purification and drying applications, it maximizes efficiency, reduces maintenance, and supports sustainability initiatives. This valve is designed to withstand demanding adsorption processes such as Molecular Sieve Dehydration, where the CFV isolation valve is suitable for both isolation and switching valve applications.

Featuring an anti-fouling design with gate containment plates, isolating process media from the body cavity at all positions of the stroke, ensuring reduced-maintenance operation. Self-cleaning, live-loaded seats provide tight shutoff , independent of process pressure, meeting industry standards. Top-entry design allows the valve to be serviced in-line making it ideal for a variety of applications.

See More Resources
Row triangle Shape Decorative svg added to top
Row triangle Shape Decorative svg added to bottom

Why Choose Our Isolation Valve

Hover or tap for more information.

Tight Bi-Directional Shut-Off and Isolation

Dual live-loaded seats maintain continuous contact with the gate throughout the full stroke, providing tight bi-directional shut-off and reliable isolation. In industries where even trace amounts of leakage can create safety or environmental risks, zero valve leakage means meeting or exceeding the toughest standards consistently.

Gate Containment Plates

Traps process media within the gate orifice throughout the full stroke preventing fouling and buildup in the body cavity.

Position vs Torque Seated

Our position-seated design does not rely on high seating forces to drive the closure element into the seat, unlike conventional gate and ball valves. This reduces actuator force requirements and minimizes damage to internal components or seizure that can occur when increased torque is applied over time in an attempt to improve valve seating.

High Performance

Fire tested to API 607/6FA standards.

Long Service Life

Hardened, polished, self-cleaning, live-loaded metal seats ensure reliable shut-off and extended service life, helping prevent unplanned shutdowns and reduce maintenance.

Top-Entry Design

Allows in-line servicing and replacement of valve internals through the bonnet flange without removing the valve body from the pipeline.

Direct Valve Drop-In

Designed as a direct replacement for an existing full/reduced-port ball valve, utilizing standard B16.10 face-to-face dimensions. Custom Face-to-Face dimensions are available.

Pipeline System Operations

Supports safe and effective pipeline maintenance by providing full-bore, through-valve passage that results in seamless operations with no downtime.

Sustainability

Designed to reduce fugitive emissions by featuring Low Emission Certified Packing per API 622/624, aligning with industry sustainability goals and regulations.

Versatility

Suitable for hydrocarbons at high temperatures (up to 800°F), solid-laden liquids, and contaminant-bearing
vapor streams.

See More Resources
Row midpoint Shape Decorative svg added to top
Row edge-slant Shape Decorative svg added to bottom

Emissions and
Sustainability

At Critical Flow Valves, we know that hitting your sustainability targets matters just as much as operational efficiency. That’s why our severe-service isolation valves are specifically designed to actively reduce fugitive emissions. Featuring Low Emission Certified Packing per API 622 and 624 standards, these valves offer zero leakage to protect the environment. Choose CFV to keep your operations running seamlessly while staying fully compliant with today’s strict industry sustainability goals.

World class products
for severe-service
applications

Key Design Features

Actuation Options per Customer Requirement

See a Critical Flow Valves representative for height restricted installations, and custom solutions.

Robust High Temperature Sealing and Seat Design
  • Solids, Slurries, Liquids, Vapors
Key design features rendering

1

Pneumatic Actuator Assembled With Controls Packages That Meets Your Needs
Pneumatic Actuator Assembled With Controls Packages That Meets Your Needs

2

Yoke is Prepped for Your Choice of Instrumentation
Yoke is Prepped for Your Choice of Instrumentation
  • Limit switches, transmitters
  • Visual travel indications on both sides

3

Live-Loaded Packing Gland
Live-Loaded Packing Gland
  • Compliant with industry low emissions standards

4

Blowout Prevention-Back Seat Design
Blowout Prevention / Back Seat Design

5

Open Body
Open Body
  • Continuous conduit extending into the lower portion of the body

6

Wide Bonnet Opening
Wide Bonnet Opening
  • Top entry, in-line serviceable

7

Industry Standard Face to Face Dims
Industry Standard Face to Face Dimensions per B16.10, B16.5, B16.47
  • Enables seamless replacement of existing valves in the field
  • Custom face to face dimensions available
  • End connections includes Raised Face (RF), Ring Type Joint (RTJ), Butt Weld (BW)

8

Bi-Directional Flow Control
Bi-Directional Flow Control

9

Tight Shut-Off
Tight Shut-Off (TSO), Double Live-Loaded Self-Cleaning Seats

10

Containment Plates
Containment Plates
  • Plates mechanically clamp against the gate, encapsulating process media between the plates and gate opening throughout the entire stroke

11

Process Media Captured and Contained
Process Media Captured and Contained Throughout the Stroke, Reintroduced into Process Media When Opened

12

Bottom Flange
Bottom Flange
  • Removal of bottom flange allows access to perform internal inspection during off-line event without removing the valve from the line.
  1. Pneumatic Actuator Assembled With Controls Packages That Meets Your Needs
  2. Yoke is Prepped for Your Choice of Instrumentation
    • Limit switches, transmitters
    • Visual travel indications on both sides
  3. Live-Loaded Packing Gland
    • Compliant with industry low emissions standards
  4. Blowout Prevention / Back Seat Design
  5. Open Body
    • Continuous conduit extending into the lower portion of the body
  6. Wide Bonnet Opening
    • Top entry, in-line serviceable
  7. Industry Standard Face to Face Dimensions per B16.10, B16.5, B16.47
    • Enables seamless replacement of existing valves in the field
    • Custom face to face dimensions available
    • End connections includes Raised Face (RF), Ring Type Joint (RTJ), Butt Weld (BW)
  8. Bi-Directional Flow Control
  9. Tight Shut-Off (TSO), Double Live-Loaded Self-Cleaning Seats
  10. Containment Plates
    • Plates mechanically clamp against the gate, encapsulating process media between the plates and gate opening throughout the entire stroke
  11. Process Media Captured and Contained Throughout the Entire Stroke, Reintroduced into Process Media When Opened
  12. Bottom Flange
    • Removal of the bottom flange allows access to perform internal inspection during off-line event without removing the valve from the line.
Row midpoint Shape Decorative svg added to top

Technical Data

Specifications
Size*2 inch up to 36 inch [50mm up to 900mm]
Pressure ClassCL150, CL300, CL600, CL900
Body MaterialASME SA217, SA216, SA351
Seat Material**ASME SA182, SA217, SA351, SA387, SA240, AISI 630
Gate Material**ASME SA387, SA240
Stem Material**Nitronic 50 ASME A479 GRXM-19
BoltingASME SA193, SA194, A479 GRXM-19
ActuationElectric, pneumatic, manual, bare stem
Engineering and ASME Standards
B16.5 / B16.47Pipe flange and flanged fittings
B16.10Face-to-face and end-to-end dimensions of valves
B16.34Pressure / temperature charts per materials
API 598, FCI 70.2, ISO 5208Valve inspection and testing
API 600Steel gate valves
API 607 / 6FAFire-safe specification
API 624, ISO 15848-1Fugitive emissions testing
Isolation Valve dimensions diagram

Envelope Dimensions - Class 600

Valve SizeB16.10 F/F*Envelope DimensionsWeight
in [mm]A
[mm]		B
in [mm]		C
in [mm]		D
in [mm]		lb [kg]
2 [50]11.5 [292]30.1 [765]6.7 [170]7.4 [189]883 [400]
3 [75]14.0 [356]35.3 [897]8.9 [226]9.0 [229]949 [430]
4 [100]17.0 [432]38.5 [978]11.2 [284]9.75 [248]1050 [476]
6 [150]22.0 [559]64.9 [1648]15.7 [398]15.0 [381]1745 [792]
9 [200]26.0 [660]77.1 [1958]19.7 [500]17.0 [432]2435 [1105]
10 [250]31.0 [787]86.3 [2192]23.5 [597]20.3 [514]3171 [1438]
12 [300]33.0 [838]91.3 [2319]27.4 [695]23.0 [584]3744 [1698]
14 [350]35.0 [889]100.8 [2560]29.0 [737]23.8 [603]4544 [2061]
16 [400]39.0 [991]108.6 [2758]34.1 [865]29.6 [752]9205 [4176]
18 [450]43.0 [1092]117.0 [2972]37.7 [959]30.3 [769]10474 [4751]

*Complete capabilities include Class 150, 300, 600, and 900 ranging from 2”-36” NPS, reference dimensions available upon request
**Other material options available. Consult with Critical Flow Valves for more details

Chart dimensions assume pneumatic actuation.
Dimensions and weights are provided for reference only.

Download the Isolation Valve Brochure