Pressure Relief Valve (PRV's)

Midland Pressure Relief Valves offer performance, reliability and flexibility of use in one easy to maintain, reliable product design. Interior and exterior valve body designs are available in every DOT pressure rating, from 75 psig to 450 psig, and flow rates up to 37,000 scfm. Midland provides the appropriate valve to meet your application needs.
Plus, Midland experience delivers technically superior products that perform over the long haul. Seals are easily replaced for use with diverse commodities to maximize the in-service time of every tank car. Sealed spring chambers and bubble-tight seal testing of every valve assure long-life and safe operation, even when used in harsh chemical environments.
Pressure Relief Valve
  • Features/Benefits
  • Internal Models
  • External Models
  • Midland offers the largest variety and range of pressure relief valves in the industry. Midland pressure relief valves are used in a wide range of applications and provide the additional security of being a re-closing pressure relief device. Internal and external valve designs are available in pressure ratings from 75 psig to 165 psig, and flow rates up to 35,527 scfm
  • O-Ring seals are easily replaced and can be used with a diverse range of commodities to maximize the in-service life of every tank car
  • All valves include wire-tamper seals with the assembler’s ID number, providing traceability back to Midland and the employee who assembled and tested the valve
  • Years of knowledgeable design and testing has resulted in valves with superior reliability, maximum flow rates, repeatable set pressures, and easy maintenance
  • Internal style valves provide a low profile installation and are excellent choices for noncorrosive commodities
  • Combination devices incorporate a rupture disc with a pressure relief valve, providing corrosion protection for the relief valve
  • PVDF insert valves are also available for aggressively corrosive services such as HCL
  • Instructions for Internal-Style Valves
  • A-1075 THRU A-1450 - Midland Internal Pressure Relief Valve; Carbon Steel Body; 75 PSIGStart-to-Discharge; 1,109 SCFM Flow Rate (Air); (4) 7/8” Diameter Holes on 6 ¼”Bolt Circle; Tongue in Groove Flange; AAR Approval # PRD092020 Expires27-Jul-2020
  • A-1075-F THRU A-1450-F - Midland Internal Pressure Relief Valve; Carbon Steel Body; 75 PSIGStart-to-Discharge; 1,109 SCFM Flow Rate (Air); (4) 7/8” Diameter Holes on 6 ¼”Bolt Circle; Flat Face Flange; AAR Approval # PRD092020 Expires 27-Jul-2020
  • A-1075-JCP THRU A-1450-JCP
  • A-2085 THRU A-2089 - Midland Internal Pressure Relief Valve; Carbon Steel Body; 75 PSIGStart-To-Discharge; 17,830 SCFM Air Flow Rate; (8) ¾” Thru Holes on 10 ¼” DiameterBolt Circle; AAR Approval # PRD112003
  • A-2089-PI-MO - Midland Internal Pressure Relief Valve; 304 Stainless Steel Body; 75 PSIGStart-To-Discharge; 18,062 SCFM Air Flow Rate; (8) ¾” Thru Holes on 10 ¼”Diameter Bolt Circle; AAR Approval # PRD112003
  • A-2095 - Midland Internal Pressure Relief Valve; Carbon Steel Body with Stainless Trim;75 PSIG Start-To-Discharge; 20,464 SCFM Air Flow Rate; (8) ¾” Thru Holes on 10¼” Diameter Bolt Circle; AAR Approval # PRD122006
  • A-2097 - Midland Internal Pressure Relief Valve; Carbon Steel Body with Stainless Trim;75 PSIG Start-To-Discharge; 21,602 SCFM Air Flow Rate; (8) ¾” Thru Holes on 10¼” Diameter Bolt Circle
  • A-2099 - Midland Internal Pressure Relief Valve; 304 Stainless Steel Body with StainlessTrim; 75 PSIG Start-To-Discharge; 20,555 SCFM Air Flow Rate; (8) ¾” Thru Holes on 10 ¼” Diameter Bolt Circle
  • A-2099-PI-MO
  • A-2100 THRU A-2169
  • A-22075/22076 - Midland High-Flow Internal Pressure Relief Valve for Crude and Ethanol, 75 PSIG start-to-discharge, 30,000 SCFM
  • A-3400 SERIES, A-3404 SERIES