Midland A-1075 Installation, Operation & Maintenance Manual Download Page 1

Page: 1 / 42

P/N: A-1000, Rev. 3.2

Issue Date: April 1

, 2018

Supersedes: A-1000, Rev. 3.1

Internal-Style Pressure Relief Valve

A-1000 Series

Installation, Operation & Maintenance (IOM) Manual

Manual content is subject to change.
Visit

www.midlandmfg.com

for latest manual revision and revision history.

Summary of Contents for A-1075

Page 1: ...2018 Supersedes A 1000 Rev 3 1 Internal Style Pressure Relief Valve A 1000 Series Installation Operation Maintenance IOM Manual Manual content is subject to change Visit www midlandmfg com for latest...

Page 2: ...es 9 F Valve Installation 12 Installation Procedure and Required Tools 12 Leak Inspection 14 Valve Operation Notes and Precautions 14 O Valve Qualification 15 Valve Disassembly and Required Tools 15 C...

Page 3: ...Please carefully read each of the following warnings and cautions prior to performing any work WARNING Toxic Hazard Always use extreme caution and proper equipment when involved with hazardous materia...

Page 4: ...ON Valve Stem Straightening Straightening of the stem by bending it in a press may result in the buildup of uneven stresses in the stem which may result in valve malfunction CAUTION Valve Spring Failu...

Page 5: ...Conducting this procedure may be hazardous depending on the commodity in the tank car Maintenance personnel should be carefully trained before being permitted to perform the procedure below on a press...

Page 6: ...low flow rates ranging from 1 109 to 4 705 standard cubic feet per minute scfm 2 1 Valve Details Tongue and Groove Series ITEM QTY PART NAME 1 1 TOP GUIDE 2 1 STEM 3 1 RETAINER 4 1 BODY 5 1 SPRING 6 1...

Page 7: ...8 1 TOP LOCKNUT STEEL PLATED3 10 8 CS STAINLESS STEEL 10 8 SS 9 1 WASHER NEOPRENE 10 9 NE NEOPRENE 10 9 NE 10 1 SEAT O RING BUNA N1 10 10 BN BUNA N1 10 10 BN 11 1 STEM O RING BUNA N1 10 11 BN BUNA N1...

Page 8: ...50 450 4705 10 450 AS 12 450 SS Table 2 3 A 1075 Thru A 1450 Stainless Steel Trim Model Specifications Tongue and Groove Series VALVE PART NO A 1079 THRU A 1379 STAINLESS STEEL PRESSURE SETTING PSIG F...

Page 9: ...ace Series ITEM QTY PART NAME 1 1 TOP GUIDE 2 1 STEM 3 1 RETAINER 4 1 BODY 5 1 SPRING 6 1 FOLLOWER 7 1 SPRING GUIDE TUBE 8 1 TOP LOCKNUT 9 1 WASHER 10 1 SEAT O RING 11 1 STEM O RING 12 1 ADJUSTMENT NU...

Page 10: ...10 7 SS 8 1 TOP LOCKNUT STEEL PLATED3 10 8 CS STAINLESS STEEL 10 8 SS 9 1 WASHER NEOPRENE 10 9 NE NEOPRENE 10 9 NE 10 1 SEAT O RING BUNA N1 10 10 BN BUNA N1 10 10 BN 11 1 STEM O RING BUNA N1 10 11 BN...

Page 11: ...2 10 300 AS 12 330 SS A 1375 F 375 4220 10 375 AS 12 375 SS A 1450 F 450 4705 10 450 AS 12 450 SS Table 2 7 A 1075 F Thru A 1450 F Stainless Steel Trim Model Specifications Flat Face Series VALVE PART...

Page 12: ...y vary by valve model Do not exceed 200 ft lb 3 1 1 Remove the old valve and then insert a soft rubber plug into the tank opening to prevent debris from entering the tank during cleaning of the valve...

Page 13: ...n these diameters will make it difficult to fit the tongue into the groove If the tongue is peened over remove excess material to meet AAR tongue tolerances CAUTION To prevent tongue damage do not ins...

Page 14: ...owner specifications No leaks should be present WARNING Valve Leakage Improper valve tongue seating in the flange groove loose nuts and damaged gaskets may result in leaks at the valve mounting joint...

Page 15: ...pring Adjustment 13 15 16 Spring Adjustment Nut 12 15 16 Top Locknut 8 1 Flats on O Ring Retainer 3 Other Tools Supplies and Equipment Silicone Grease Kytox GPL204 or equivalent Stem 2 Spring Compress...

Page 16: ...4 1 2 Remove the four 4 nuts item 15 securing the top guide item 1 to the valve body item 4 TIP Use a 3 4 wrench to remove the four nuts item 15 Figure 4 2 Remove the Four Nuts 4 1 3 Remove the top gu...

Page 17: ...h to hold the retainer in place item 3 Figure 4 5 Loosen Locknut 4 1 6 Remove the top locknut item 8 from the valve stem item 2 TIP Use a 15 16 wrench to remove the locknut item 8 Figure 4 6 Remove Lo...

Page 18: ...of catastrophic failure of the stem serious injury could occur TIP Use two 2 15 16 wrenches of suitable length Figure 4 9 Loosen Locknut 4 1 10 Next remove only the locknut item 13 from the valve ste...

Page 19: ...rt the stem and let it down gently Figure 4 13 Allow Valve Spring to Expand 4 1 14 Remove the valve from the press taking care to lift it by the valve stem item 2 This will prevent the stem from falli...

Page 20: ...g com for latest manual revision and revision history 4 1 16 Remove the spring follower item 6 Figure 4 14 Remove Spring Follower 4 1 17 Remove the valve spring item 5 from the guide tube Figure 4 15...

Page 21: ...inspection methods can miss defects when applied incorrectly A program developed under the guidance of a qualified American Society of Non Destructive Testing ASNT Level III Technician is recommended...

Page 22: ...esidual product and other foreign material from the stem item 2 Magnetic particle or dye penetration inspection can be used to detect cracks Also inspect for corrosion pitting Any corrosion pitting is...

Page 23: ...WARNING Valve Stem Eccentricity Excessive valve stem eccentricity will cause binding that can result in high start to discharge pressure settings reduced valve capacity and or low vapor tight pressure...

Page 24: ...t with a cloth and a suitable solvent Visually inspect for gouges and corrosion Run your fingernail around the tongue to detect any flaws Use a flashlight and or magnifying glass if you are uncertain...

Page 25: ...nd uncontrolled valve venting Test the springs by pressing them to 80 of maximum deflection in a press for two 2 minutes Remove from the press and then measure the spring free height If free height is...

Page 26: ...inds look for dents or gouged surfaces on the inside of the guide tube Repair the damage to allow free movement of the spring follower Inspect all weld areas for cracks or pitting Figure 4 25 Guide Tu...

Page 27: ...O Ring Retainer 3 Other Tools Supplies and Equipment Spring Compression Press Spring 5 Wood Block For Valve Stem Support 2 Table 4 3 Recommended Tools for Valve Reassembly 4 3 1 Mount the bumper wash...

Page 28: ...1 Figure 4 30 Assemble Top Guide and Stem Assembly 4 3 5 Mate the top guide item 1 and the body item 4 aligning holes with the studs Figure 4 31 Align Body with Studs 4 3 6 Mate the spring guide tube...

Page 29: ...4 3 10 Place the assembly from step 4 3 9 into the compression fixture 4 3 11 Know the required start to discharge pressure of the valve you are working on Using your spring compression press slowly c...

Page 30: ...wrench calibrated to 65 5 ft lb CAUTION Be careful to avoid rotation of the stem Rotation of the stem can damage the seat TIP Use a 15 16 wrench to tighten top locknut item 8 Figure 4 38 Tighten Top...

Page 31: ...hch no bubbles are detected Midland recommends that no bubbles be observed for two 2 minutes at vapor tight 4 4 1 Test Stand and Gauge Requirements It is recommended that the test stand mounting must...

Page 32: ...224 300 240 330 264 375 300 Table 4 4 Start To Discharge STD and Vapor Tight Pressure VTP Settings 4 4 3 3 Observe the STD pressure and then bleed off the pressure slowly to observe the VTP 4 4 3 4 Re...

Page 33: ...nch to loosen the adjustment nut item 12 Figure 4 44 Loosen Locknut 4 5 3 Using a press invert the valve to compress the spring and relieve pressure from the spring adjusting nut Use a tubular yoke th...

Page 34: ...nut item 13 against the spring adjustment nut item 12 to lock the setting Figure 4 48 Tighten Locknut 4 5 7 Retest the valve STD and determine how much pressure change occurred when the spring adjustm...

Page 35: ...test fixture 4 6 2 Wipe or blow away any remaining soap suds and water used in the testing Figure 4 49 Wipe Away Water or Soap Suds 4 6 3 Install seal wire item 16 Figure 4 50 Install Seal Wire 4 6 4...

Page 36: ...ar owner s standard maintenance program to ensure the valve performs the intended function without failure until the next qualification or for the design life 5 1 Repair Procedure NOTICE When performi...

Page 37: ...o allow the top guide to be reinstalled in the same orientation Lift up and remove the top guide item 1 Figure 5 3 Remove Top Guide 5 1 4 Next put a wrench on the flats of the O ring retainer item 3 a...

Page 38: ...6 Insert 2 O rings items 10 and 11 into the retainer item 3 Figure 5 6 Insert O Rings 5 1 7 Place the retainer item 3 with the seat O ring assembly onto the stem item 2 so that it rests squarely on t...

Page 39: ...s to Top Guide 5 1 11 Testing Process To complete this process it will be necessary to pressurize the tank car in accordance with car owner s requirements Bubble leak seat test must be preformed per c...

Page 40: ...porary measure once the car is unloaded and pressure is relieved the valve should be removed for complete inspection repairs and full qualification in accordance to the car owner s standard qualificat...

Page 41: ...Below for Suffix Item Description Examples 10 10 10 XX Seat O Ring 10 10 BN Seat O Ring Buna N 11 10 11 XX Stem O Ring 10 11 NE Stem O Ring Neoprene Suffix Suffix Description BN Buna N BNFG Buna N Fo...

Search results

Summary of Contents for A-1075

Reviews:

Brands by name

Popular brands

Midland A-1075, Installation, Operation & Maintenance Manual

Search results

Summary of Contents for A-1075

Reviews:

Brands by name

Popular brands