Search by keyword

Search by Catalog Number


Sign up for our Email Newsletter

Dr. Andrew's Corner

Contact Us

Dealer List

Product Finder



About Us

Trade Shows


Review Basket

Running Men
4125 Market St #10
Ventura, CA 93003
(800) 235-3333
# K270: K-VALVE (Low Resistance, non-rebreathing, 2-way)

Unique tri-cuspid valve diaphragm allows nearly straight-through flow (MRI compatible)

(Click on photo to see exploded view,
then on BACK button to return)

The lowest resistance, lowest leakage, lowest dead space valve.


Because the unique tri-cuspid valve diaphragm collapses onto itself and allows nearly straight-through flow, see photo.

  • Rated up tp 800 liters per minute for exercise testing
  • Dead space only 40 cc
  • Fewer parts: Complete valve consists of only 5 parts
  • Functions in any position - not gravity dependent
  • Clear plastic body to view diaphragm operation
  • Threaded inhalation and exhalation ports allow
    easy assembley and disassembly
  • Easy to adapt custom fittings and accessories
  • Diaphragm molded of silicone means long life, non-sticking. Nom diameter = 1 inch.
    maintains elasticity and sensitivity
  • All ports are 1-3/8" (35mm) OD, 1-1/8" ID
    fit all 1-3/8" (35mm) mouthpieces and tubing
  • Weight 0.19 pound

To use the K-valve with a face mask, we suggest the V-Mask with K270-V adapter.
To order this setup, order the K-Valve, a V-Mask Face Piece, the K270-V adapter and a headgear.

We can install gas sampling ports, specify location, such as in body or mouthport.

Replace valve diaphragm every 4 to 6 month to minimize leakage

Last Updated:12 Nov 2022

Qty Product Catalog Number Price

Connector, K-Valve to V-Mask K270-V 115.00

Replacement K-Valve Diaphragm, no more K278 0.01

Labor Charge to install Sampling Port K1912 32.00
  Buy 3 or more for $25.00 each

Luer Lock Sampling Port (specify location) K1913 3.00

Gas Sampling port. 1/8" hosebarb (specify location) K1919 3.00

Head Support for K270 K2726 155.00

Adapter to connect K-valve to older Exercise Stress Test Masks K1186 95.00

Adapter to connect K-valve to KM Mask K270-KM 115.00