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Purpose-Built Transmitter Isolation and Sampling Valves

Purpose-built to protect your process.

The only valve maker to offer a full port 3” ball valve built exclusively around transmitter isolation. We replace the failure-prone knife-gate valves plants have historically used with a purpose-engineered ball valve that simply works — and calibrates in place.

See Why It’s Better →
305 B Flow Path
Best Design · Transmitter isolation
FIG. 305 B
3″ full port
316 SS body
Calibrate-in-place
ZERO
Warranty claims since 1997
3″
Patented full-port design
1997
Family owned & operated
100%
Stainless construction
The Problem

Your knife-gate valve was never built for this.

Knife-gate valves were designed to stop bulk flow in a pipe. Then, because of their small end to end dimensions, pressed into applications isolating sensitive instruments. That is why the same failures keep showing up on your maintenance tickets:

  • Valves that can't fully close a failure that can force a tank drain-down  
  • Valves that leak at stem and seats
  • Carbon-steel yokes that rot off in wet, corrosive environments
  • Product buildup that distorts pressure and level readings
  • Antiquated calibration time consuming and safety issues 

We build a valve for exactly for this job — and nothing else.

Fig. 305 B Resized A
Repurposed vs. Purpose-Built

A valve built for one job beats a valve adapted to it.

The same application. A completely different outcome on the plant floor.

⚠️ The status quo
Repurposed Knife-Gate Valve
  • ✕ Gate design leaves dead space where product builds up in the valve and against the sensor
  • ✕ Multi – turn and prone to leaks. Possible draining the vessel / tank contents if the valve won’t fully close.
  • ✕ Carbon-steel yokes corrode and fail in harsh service
  • ✕ Often requires transmitter removal to calibrate
  • ✕ One niche SKU inside a catalog of hundreds — nobody’s specialty
✓ The Trans-Valve way
Purpose-Built Isolation Ball Valve
  • ✓ Patented 3″ full port gives the sensor a clean, unobstructed view
  • ✓ Quarter-turn, bubble-tight shutoff — Easy open and close.
  • ✓ All-stainless body and wetted parts; nothing to rot off
  • ✓ Dedicated calibration port — calibrate in place, no drain-down
  • ✓ Built by the only team whose main focus is transmitter isolation
What Sets Us Apart

Four reasons plants switch —
and never go back.

01

Purpose-Built, Not Repurposed

“A valve built for one job beats a valve adapted to it.”

We engineered our valve from the transmitter backward — a clean, easy to operate, full-port ball valve that gives the sensor an unobstructed view of the process and nowhere for product to hide.

02

Reliability You Can Prove

“Zero warranty claims since 1997. Zero.”

Reliability claims are cheap; a track record is not. Nearly three decades of purpose-built isolation and sampling valves in hard service, without a single warranty claim — all in stainless that won’t rot off.

03

Calibrate in Place, Stay in Production

“The best maintenance window is the one you never have to open.”

A dedicated purge and calibration port lets your techs verify transmitter readings without breaking the line, draining the tank or interrupting the process — What was once complicated is now a routine check.

04

Drop-In Upgrade, Specialist Backing

“Upgrade the valve, not the whole installation.”

Our valves bolt to both existing knife-gate patterns and standard ANSI 150# flanges, so most upgrades are a straight swap. And when a job needs a custom body, material, or hard-to-find legacy part, we build it.

Products Available

Specialty valves, built and stocked.

Three product families, decades of refinement, and the engineering expertise to build the one you need but can’t find anywhere else.

Isolation Ball Valves

Transmitter Isolation Ball Valves

Faster, stronger, cleaner. 3″ sensing port, ANSI 150# four-bolt and knife-gate flanged mounting, single-port purge and calibrate-in-place. 316 / 317L stainless and Grade-5 titanium builds.

FIG. 305 B FIG. 305 LT FIG. 305 AT FIG. 105 B FIG. 105 BD FIG. 115
Sampling Valves

Plunger-Style Sampling Valves

 Spring-closed, plunger-type valves for taking bulk or batch samples from pipes and tanks. Reasonably priced, well built, and usually in stock — with seat options for almost any media. 

FIG. 15 B NITRILE PEEK PTFE UHMWPE VITON
Custom Capabilities

Custom Valves & Hard-to-Find Parts

Pellet-service valves, high-pressure ball valves rated to 6,000 PSI, and sourcing for hard-to-find stems, balls, and soft goods — in CS, DI, stainless, titanium, Hastelloy, Alloy 20, etc..

PELLET SERVICE HIGH PRESSURE POA
Where We Work

Trusted wherever a reading runs the process.

If buildup, calibration, and corrosion are draining your maintenance hours, contact us.

Pulp & Paper

Buildup around level transmitters on digesters and stock lines.

Chemical Processing

Aggressive media that destroys repurposed gate valves.

Water & Wastewater

Reliable level isolation across clarifiers and treatment trains.

Mining

Abrasive slurries and harsh duty that demand stainless.

Food Processing

CIP-friendly purge ports and clean shutoff for sanitary lines.

Oil & Gas

Positive shutoff and exotic alloys for critical service.

Power Generation

Steam-drum and boiler level loops that can’t go offline.

Pharmaceutical

Validated, contamination-free isolation for regulated process.

Don't Just Take Our Word For It

The record, in the words of the plant floor.

download (1)-1
Installed worldwide · Process plants

“The Fig. 305 B corrected packing issues we were having with knife-gate isolation valves.”

— Maintenance, process plant

“The carbon-steel yokes rot off the older knife-gate valves. No worries with that now.”

— Reliability engineer

“Calibration in place really saves us a lot of time.”

— Instrumentation tech
0
Zero warranty claims since 1997. Nearly three decades of purpose-built isolation valves in hard service — without a single claim. We'd rather show you the record than tell you about peace of mind.
Get the Facts

Stop re-buying the valve that was never built for this.

Get “8 Reasons Ball Valves Outperform Knife-Gate Valves in Transmitter Isolation Applications,” or talk to the team that specializes in this.

Get the Facts → Call +1 205.833.6864