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Pressure Relief Valves (PRV) for General Purpose Cars

Internal Pressure Relief Valves

Midland Internal Pressure Relief Valves offer performance, reliability and flexibility of use in one easy to maintain, reliable product design. Interior valve body designs are available in pressure ratings, from 75 psig to 165 psig, and flow rates up to 35,608 SCFM. Midland provides the appropriate valve to meet your application needs.

Plus, Midland's 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.

Features & Benefits

  • 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 valve designs are available in pressure ratings from 75 psig to 165 psig, and flow rates up to 35,608 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 an excellent choice 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

Small Internal Models

Base Model Note Mounting Flange Mount Thickness STD Pressure (psig) Flow Rate (scfm) Net Flow Area AAR# Materials Drawing
A-1075 PRV with stack Tongue and groove .75" 75 1109 PRD202125 Carbon Steel w/ SS trim A-1000
PRV with stack Flat face .75" 75 1109 PRD202125 Carbon Steel w/ SS trim A-1000-F Series
A-1079 PRV with stack Tongue and groove .75" 75 1113 PRD202125 Stainless Steel A-1000
PRV with stack Flat face .75" 75 1113 PRD202125 Stainless Steel A-1000-F Series
A-1165 PRV with stack Tongue and groove .75" 165 2329 PRD202125 Carbon Steel w/ SS trim A-1000
PRV with stack Flat face .75" 165 2329 PRD202125 Carbon Steel w/ SS trim A-1000-F Series
A-1169 PRV with stack Tongue and groove .75" 165 2611 PRD202125 Stainless Steel A-1000
PRV with stack Flat face .75" 165 2611 PRD202125 Stainless Steel A-1000-F Series

Large Internal Models

Base Model Note Mounting STD Press. (psig) Flow Rate (scfm) Net Flow Area AAR# Materials Drawing
A-22076 High-Flow Flat face 75 29,550 20 PRD122007 Carbon Steel, Nickel Plated A-22076
High-Flow w/ guide tube Tongue and Groove 75 29,550 20 PRD122007 Carbon Steel, Nickel Plated A-22076-PI
High-Flow w/ guide tube Flat face 75 29,550 20 PRD122007 Carbon Steel, Nickel Plated A-22076-PI-F
A-2085 w/o guide tube Flat face 75 17830 11.38 PRD112003 Carbon Steel w/ SS trim A-2035-Thru-A-2089
w/ guide tube Tongue and Groove 75 17830 11.38 PRD112003 Carbon Steel w/ SS trim A-2085-PI
w/ guide tube Tongue and Groove 75 17830 11.38 PRD112003 Stainless Steel A-2085-PI-MO
A-2089 w/o guide tube Flat face 75 18062 11.38 PRD112003 Stainless Steel A-2035 THRU A-2089
w/ guide tube Tongue and Groove 75 18062 11.38 PRD112003 Stainless Steel A-2085-PI-MO
A-2097 w/o guide tube Flat face 75 21602 16.36 PRD112006 Carbon Steel w/ SS trim A-2097
w/ guide tube Tongue and Groove 75 21602 16.36 PRD112006 Carbon Steel w/ SS trim A-2097-PI
A-2095 w/o guide tube Flat face 75 20555 16.36 PRD112006 Carbon Steel w/ SS trim A-2095, A-2099
A-2099 w/o guide tube Flat face 75 20555 16.36 PRD112006 Stainless Steel A-2095, A-2099
w/ guide tube Tongue and Groove 75 20555 16.36 PRD112006 Stainless Steel A-2099-PI-MO
A-2165 w/o guide tube Flat face 165 35608 11.38 PRD112003 Carbon Steel w/ SS trim A-2100 SERIES
w/ guide tube Tongue and Groove 165 35608 11.38 PRD112003 Carbon Steel w/ SS trim A-2165-PI-A-2169-PI
w/ guide tube Flat face 165 35608 11.38 PRD112003 Carbon Steel w/ SS trim A-2165-PI-F
A-2169 w/o guide tube Flat face 165 35527 11.38 PRD112003 Stainless Steel A-2100 SERIES
w/ guide tube Tongue and Groove 165 35527 11.38 PRD112003 Stainless Steel A-2165-PI-A-2169-PI
w/ guide tube Flat face 165 35527 11.38 PRD112003 Stainless Steel A-2169-PI-F

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Contact Us for Technical Support on Your Projects and Resolving Any Technical Issues You Encounter

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