Vacuum Relief Valves (VRV)
he latest innovation in vacuum relief valve technology for rail tank cars is the Midland “No Step” vacuum relief valve. The new Midland “No Step” vacuum relief valve is designed to prevent the vacuum relief valve from being used as a foot valve to relieve pressure from the rail tank car. This innovative design allows the valve to only be operated in the event that vacuum conditions are reached in the car.
The new “No Step” design was created to help eliminate NAR’s from vacuum relief valves that are caused by damage during loading and unloading operations. Quad seals in the vacuum relief valve provide excellent sealing in both pressure and vacuum conditions. Vacuum relief valve settings are available from 3/4 psi and higher.
A-210, 212 VRV Flyer (click HERE).
The A-212 VRV is also available as part of Midland’s convenient DOT 117/117R solutions, designed to help customers meet the latest requirements for high-hazard flammable trains (HHFT) and high-hazard flammable unit trains (HHFUT).
Features & Benefits
- “No step” design eliminates improper cycling of the valve to release pressure
- Unique seal design eliminates the possibility of using incorrect materials or performing improper installation
- Stainless steel construction for better corrosion resistance
- Tamper-evident seal wire on top screws
- Pressure settings from 3/4 psi and higher
- The stem is guided in two places
- This reduces accidental cycling or “burping” of the valve due to car impact or vibration
- Gives the valve a more consistent seal and decreases the chances of pressure leaks
Models / Drawings*
| Base Model | Type | Note | Connection | Material | Set-To-Discharge | AAR Approval | Drawing |
| A-207 | Threaded | w/o cap | 2-1/2″ NPT | Stainless Steel (passivated) | (.75psi thru 5psi settings available) | E202130 | A-207-S |
| A-209 | Threaded | No Step | 2-1/2″ NPT | Stainless Steel | (.75psi thru 5psi settings available) | E202127 | A-209-W-NS |
| A-210 | Threaded, Enhanced | Baffle, Screen | 2-1/2″ NPT | Stainless Steel | (.75psi thru 5psi settings available) | E092002 | A-210-FR1 |
| A-210 | Threaded, Enhanced | Baffle, Premium Screen | 2-1/2″ NPT | Stainless Steel | (.75psi thru 5psi settings available) | E092002 | A-210-FR2 |
| A-210 | Threaded, Enhanced | Screen | 2-1/2″ NPT | Stainless Steel | (.75psi thru 5psi settings available) | E092002 | A-210-FR10 |
| A-210 | Threaded, Enhanced | Premium Screen | 2-1/2″ NPT | Stainless Steel | (.75psi thru 5psi settings available) | E092002 | A-210-FR20 |
| A-211* | Threaded, Enhanced | Baffle, Screen | 1-1/2″ NPT | Stainless Steel | (.75psi thru 5psi settings available) | E102004 | A-211-FR1 |
| A-211* | Threaded, Enhanced | Baffle, Premium Screen | 1-1/2″ NPT | (.75psi thru 5psi settings available) | .75 PSI (Std.) alt. available | E102004 | A-211-FR2 |
| A-211* | Threaded, Enhanced | Screen | 1-1/2″ NPT | Stainless Steel | (.75psi thru 5psi settings available) | E102004 | A-211-FR10 |
| A-211* | Threaded, Enhanced | Premium Screen | 1-1/2″ NPT | Stainless Steel | (.75psi thru 5psi settings available) | E102004 | A-211-FR20 |
| A-212 | Flanged, Enhanced | Baffle, Screen | 3-7/8″ B.C. | Stainless Steel | (.75psi thru 5psi settings available) | E112007 | A-212-FR1 |
| A-212 | Flanged, Enhanced | Baffle, Premium Screen | 3-7/8″ B.C. | Stainless Steel | (.75psi thru 5psi settings available) | E112007 | A-212-FR2 |
| A-212 | Flanged, Enhanced | Screen | 3-7/8″ B.C. | Stainless Steel | (.75psi thru 5psi settings available) | E112007 | A-212-FR10 |
| A-212 | Flanged, Enhanced | Premium Screen | 3-7/8″ B.C. | Stainless Steel | (.75psi thru 5psi settings available) | E129509 | A-212-FR20 |
| A-217 | Threaded | No Step | 1-1/2″ NPT | Stainless Steel | (.75psi thru 5psi settings available) | E202142 | A-217-W-NS |
| A-222 | Flanged | No Step | 3-7/8″ B.C. | Stainless Steel | (.75psi thru 5psi settings available) | E202142 | A-222-W-NS |
| A-222 | Flanged | No Step, Filter | 3-7/8″ B.C. | Stainless Steel | (.75psi thru 5psi settings available) | E202142 | A-222-W-NS-FR20 |
*Note: These models are no longer available for new car builds; only available for remanufacturing and replacement orders.
Enquire about this product
All pictures shown are for illustration purpose only. Actual product may vary. All specifications are subject to change without notice.
