Relief valves are pressure control devices used in various industries to prevent equipment damage, injuries, and catastrophic incidents caused by fluid overpressure. These valves are designed to release excess pressure by opening the valve and allowing the fluid to escape when the system pressure exceeds a predetermined set point.
Relief valves are essential for maintaining safe pressure levels in various applications, including hydraulic systems, steam boilers, pipelines, and pressure vessels. They work by sensing the pressure upstream of the valve and opening at a pre-set pressure to discharge the fluid until the pressure downstream of the valve returns to a safe level.
There are various types of relief valves, including pressure relief valves, safety relief valves, and rupture discs. Each type of valve has a specific function and is suited for different applications, depending on factors such as the type of fluid, the operating pressure, and the temperature.
Overall, relief valves play a critical role in ensuring the safe and efficient operation of industrial equipment, protecting operators, and preventing damage to machinery, plant, and personnel.
Find the Relief Valves Manufacturers:
| S.no. | Company Name | Founded | Country |
|---|---|---|---|
| 1 | Norman Equipment Co. | USA | |
| 2 | Robert H. Wager Co. Inc. | USA | |
| 3 | Jayco Inc. | USA | |
| 4 | Hi-Kalibre Equipment Ltd. | USA | |
| 5 | R. Conrader Company | USA | |
| 6 | Air-Mite | USA | |
| 7 | Technetics Group | USA | |
| 8 | Swanson Flo-Systems Co. | USA | |
| 9 | Yuken Hydraulics | USA | |
| 10 | Pneudraulics Inc. | USA | |
| 11 | Hoerbiger Corporation Of America Inc. | USA | |
| 12 | Halkey-Roberts Corporation | USA | |
| 13 | Mogas | USA | |
| 14 | Atlantic Valve | USA | |
| 15 | Crissair Inc. | USA | |
| 16 | Plug Technologies Inc | USA | |
| 17 | Roll Seal Valve Co. Inc. | USA | |
| 18 | Boiler & Heat Exchange Systems Inc. | USA | |
| 19 | Ames Co. | USA | |
| 20 | Henry Technologies | USA | |
| 21 | Century Industrial Supply Inc. | USA | |
| 22 | Leffel James & Co. | USA | |
| 23 | ASCO Valve Inc. | USA | |
| 24 | Koso International Inc. | USA | |
| 25 | Electromechanical Research Laboratories Inc. | USA | |
| 26 | Anchor Text | USA | |
| 27 | Spartan Controls Ltd. | USA | |
| 28 | DeLaval International | USA | |
| 29 | Hydro Pumps Inc | USA | |
| 30 | FM Valve Co. | USA | |
| 31 | Equipment & Controls Inc. | USA | |
| 32 | ITT McDonnell & Miller | USA | |
| 33 | Howe Corporation | USA | |
| 34 | Pneumatic Control Inc | USA | |
| 35 | R-K Industries Buck Jariwala | USA | |
| 36 | Continental Hydraulics | USA | |
| 37 | Merrill Mfg. Co. | USA | |
| 38 | Vonberg Valve Inc. | USA | |
| 39 | Scott Industrial Systems | USA | |
| 40 | Paragon Products | USA | |
| 41 | Flow Safe | USA | |
| 42 | Bosch Rexroth Corp. | USA | |
| 43 | Dresser-Rand | USA | |
| 44 | Therm-X | USA | |
| 45 | Weathercaps | USA | |
| 46 | Micromat Co. | USA | |
| 47 | Logic Hydraulic Controls Inc. | USA | |
| 48 | E.C. Tool & Supply Co. | USA | |
| 49 | Flame King | USA | |
| 50 | Hydronamic Engineering Corp. | USA | |
| 51 | Griswold Controls | USA | |
| 52 | Anchor Text | USA | |
| 53 | Odrill MCM Inc | USA | |
| 54 | Heliotrope Media | USA | |
| 55 | American Fire Equipment Co. Inc. | USA | |
| 56 | Raycon Industries | USA | |
| 57 | S.P. Kinney Engineers Inc. | USA | |
| 58 | Sentinel Supply & Foundry | USA | |
| 59 | Spirotherm Inc. | USA | |
| 60 | Mirada Research & Mfg. Inc. | USA | |
| 61 | American Steam Inc. | USA | |
| 62 | Custom Plastics | USA | |
| 63 | Tri-Tech Medical Inc. | USA | |
| 64 | Bio-Chem Fluidics Inc. | USA | |
| 65 | Wilco Supply Inc. | USA | |
| 66 | BSM Pump Corporation | USA | |
| 67 | Preece Incorporated | USA | |
| 68 | Dante Valve Company | USA | |
| 69 | Farris Engineering | USA | |
| 70 | Oventrop Valves | USA | |
| 71 | Lakeside Process Controls Ltd. | USA | |
| 72 | Flodyne Controls Inc. | USA | |
| 73 | Generant | USA | |
| 74 | Control Center Inc. | USA | |
| 75 | Boston Gear | USA | |
| 76 | Wair Products | USA | |
| 77 | RR Valve Inc. | USA | |
| 78 | Anchor Text | USA | |
| 79 | Universal Components Inc. | USA | |
| 80 | FMC Invalco | USA | |
| 81 | M&H Valve Company | USA | |
| 82 | Redi Controls Inc. | USA | |
| 83 | L & J Technologies Inc. | USA | |
| 84 | Webstone Company Inc. | USA | |
| 85 | Global Servo HydraulicsInc. | USA | |
| 86 | Taylor Devices Inc. | USA | |
| 87 | Gar-Kenyon | USA | |
| 88 | Buckner Superior | USA | |
| 89 | Watts Water Technologies (Canada) Inc. | USA | |
| 90 | Burns Pressure Systems Inc. | USA | |
| 91 | L-K Industries Inc. | USA | |
| 92 | H. A. Phillips & Co. | USA | |
| 93 | Barnes & Jones Inc. | USA | |
| 94 | Vetco Gray Inc. | USA | |
| 95 | Pacific Design Technologies | USA | |
| 96 | Macro Technologies Inc | USA | |
| 97 | Applied Control Equipment | USA | |
| 98 | J.F. Bentley Co. Inc. | USA | |
| 99 | Durbin Industrial Valve Inc. | USA | |
| 100 | Spray Tech Systems Inc. | USA | |
| 101 | McElroy Manufacturing Inc. | USA | |
| 102 | Portersville Valve Co. | USA | |
| 103 | Kerr Pump & Supply | USA | |
| 104 | Anchor Text | USA | |
| 105 | G&S Valves & Fitting Co. Inc. | USA | |
| 106 | Metal Goods Manufacturing Inc. | USA | |
| 107 | Oteco | USA | |
| 108 | Hamilton W.L. Co. | USA | |
| 109 | Ames Co. | USA | |
| 110 | JFPC | USA | |
| 111 | T & S Brass & Bronze Works Inc. | USA | |
| 112 | Fixed Point Inc. | USA | |
| 113 | DTS Fluid Power LLC | USA | |
| 114 | Sherwood Valve | USA | |
| 115 | Vernay Laboratories | USA | |
| 116 | Jetstream of Houston LLP | USA | |
| 117 | Bear Pump & Equipment Inc. | USA | |
| 118 | Bay Associates | USA | |
| 119 | S & S Truck Parts Inc. | USA | |
| 120 | Control Associates Inc. | USA | |
| 121 | Alta-Robbins | USA | |
| 122 | Unibloc-Pump Inc. | USA | |
| 123 | Jim's Supply Co. Inc. | USA | |
| 124 | Flotec Inc. | USA | |
| 125 | Alemite Corp. | USA | |
| 126 | Schrader International Inc. | USA | |
| 127 | Heartland Solutions Inc. | USA | |
| 128 | Nikkiso Pumps America | USA | |
| 129 | Rubber-Cal Inc. | USA | |
| 130 | Anchor Text | USA | |
| 131 | DropsA USA | USA | |
| 132 | Aero Fluid Products | USA | |
| 133 | Aerospace Systems and Components Inc. (ASC) | USA | |
| 134 | Cyrus Shank Company | USA | |
| 135 | Gusher Pumps | USA | |
| 136 | Endyn Ltd. | USA | |
| 137 | Hans Pedersen Co. | USA | |
| 138 | Northeast Industrial and Marine Equipment | USA | |
| 139 | VRC Co. | USA | |
| 140 | Western Fluids Engineering DBA Vaplock | USA | |
| 141 | Legris Inc | USA | |
| 142 | Bliss Anand America | USA | |
| 143 | Ultraflo Systems Inc | USA | |
| 144 | Flush Quip | USA | |
| 145 | W. R. Smith & Sons Inc. | USA | |
| 146 | DULONG | USA | |
| 147 | St. Gabriel Valve Service Inc. | USA | |
| 148 | Quake Defense Inc. | USA | |
| 149 | GNC Concrete Products | USA | |
| 150 | Universal Valve Company Inc | USA | |
| 151 | Baird Manufacturing Co. | USA | |
| 152 | Ramco Manufacturing Co. Inc. | USA | |
| 153 | BS&B Safety Systems L.L.C. | USA | |
| 154 | Delta Power Co. | USA | |
| 155 | Elwood Corp. | USA | |
| 156 | Anchor Text | USA | |
| 157 | Anderson Fittings | USA | |
| 158 | Specialty & Ball Valve Engineering Inc. | USA | |
| 159 | Keywin Industries Ltd | USA | |
| 160 | PROTEGO (USA) Inc. | USA | |
| 161 | Isaacs & Associates | USA | |
| 162 | Enerpac | USA | |
| 163 | Ware Inc. | USA | |
| 164 | Norriseal Controls | USA | |
| 165 | ESAB Welding & Cutting Products | USA | |
| 166 | Trans-Market Process Systems | USA | |
| 167 | DEFINOX Inc. | USA | |
| 168 | ASCO Inc. | USA | |
| 169 | H-J Family of Companies | USA | |
| 170 | Taco Inc. | USA | |
| 171 | Stemmerich Inc. | USA | |
| 172 | Zurn Industries Inc. | USA | |
| 173 | H-O-H Water Technology Inc. | USA | |
| 174 | Sentry Equipment Corp. | USA | |
| 175 | Lincoln Industrial | USA | |
| 176 | Danfoss Power Solutions Co. | USA | |
| 177 | Keckley Company | USA | |
| 178 | Circor Energy | USA | |
| 179 | The Specialty Mfg. Co. (SMC) | USA | |
| 180 | Red Seal Measurement | USA | |
| 181 | Crispin Valves | USA | |
| 182 | Anchor Text | USA | |
| 183 | FluiDyne Fluid Power | USA | |
| 184 | AGF Manufacturing Inc. | USA | |
| 185 | Taylor Valve Technology | USA | |
| 186 | American Manufacturing Company | USA | |
| 187 | New York Replacement Parts Corp. | USA | |
| 188 | Senior Aerospace - SSP | USA | |
| 189 | Fulflo Specialties Co. The | USA | |
| 190 | Hawkins & Associates Inc. | USA | |
| 191 | Pathfinder Systems Inc. | USA | |
| 192 | co-ax valves inc. | USA | |
| 193 | Southern California Hydraulic Engineering | USA | |
| 194 | A-Best Industrial | USA | |
| 195 | Stra-Val | USA | |
| 196 | Leaucon Inc. | USA | |
| 197 | Monnier Inc. | USA | |
| 198 | Cash Acme a Brand of Reliance Worldwide Corporation | USA | |
| 199 | Pro-Dig LLC | USA | |
| 200 | HPI | USA | |
| 201 | Waterous Co. | USA | |
| 202 | CRS Service Inc. | USA | |
| 203 | Industrial Plastic Products Inc. | USA | |
| 204 | Mercury Manufacturing Co. | USA | |
| 205 | General Air Products Inc. | USA | |
| 206 | Harrington Inc. | USA | |
| 207 | Farris Engineering A Div. Of Curtiss-Wright Flow Control Corp. | USA | |
| 208 | Anchor Text | USA | |
| 209 | Atlantic Blowers | USA | |
| 210 | Flowserve | USA | |
| 211 | SharkBite a Brand of Reliance Worldwide Corporation | USA | |
| 212 | Hydraulics International Inc. | USA | |
| 213 | Hi-Vac Products Hi-Vac Corp | USA | |
| 214 | Energy Manufacturing Company Inc. | USA | |
| 215 | Gemu Valves | USA | |
| 216 | Everett J. Prescott Inc. | USA | |
| 217 | Bonomi North America Inc. | USA | |
| 218 | Power Plant Service Inc. | USA | |
| 219 | Ausco Inc. | USA | |
| 220 | Control Devices LLC. | USA | |
| 221 | K. Connelly Corporation | USA | |
| 222 | Coilhose Pneumatics | USA | |
| 223 | Houston Hydraulic | USA | |
| 224 | NNI Inc. | USA | |
| 225 | Primary Fluid Systems Inc. | USA | |
| 226 | Valv-Trol | USA | |
| 227 | Hale Products Inc. | USA | |
| 228 | The Oilgear Company | USA | |
| 229 | Georg Fischer LLC | USA | |
| 230 | Fluid Logic | USA | |
| 231 | Advanced Hydraulics Inc. | USA | |
| 232 | Ross Valve Manufacturing Co. | USA | |
| 233 | Varec Biogas | USA | |
| 234 | Anchor Text | USA | |
| 235 | EG & G Wright Components | USA | |
| 236 | Ward-Schmid Co. Inc. | USA | |
| 237 | Stratotech Corp. | USA | |
| 238 | American National Can Co | USA | |
| 239 | Fort Worth Fabrication Inc. | USA | |
| 240 | Southwest Metal Products Inc. | USA | |
| 241 | Anderson Greenwood & Co. | USA | |
| 242 | Munns R.J. Mfg. Inc. | USA | |
| 243 | Hayward Industrial Products Inc. | USA | |
| 244 | Industrial Controls & Equipment | USA | |
| 245 | Retsco Ltd. | USA | |
| 246 | Target Rock Corp. | USA | |
| 247 | Advance Technologies Ltd. | USA | |
| 248 | Hy-Production Inc. | USA | |
| 249 | ValveSpecialties Inc. | USA | |
| 250 | Warburton Valve | USA | |
| 251 | General Pneumatics Corp. | USA | |
| 252 | HHH Co. | USA | |
| 253 | Basin Valve Assembler | USA | |
| 254 | Anchor Text | USA | |
| 255 | Cooney Brothers Inc. | USA | |
| 256 | DBJ Corporation | USA | |
| 257 | Thrush Co. Inc. | USA | |
| 258 | FCX Performance | USA | |
| 259 | Rupture Pin Technology | USA | |
| 260 | Helios Technologies | USA | |
| 261 | SHF Inc | USA | |
| 262 | Doucette Industries Inc. | USA | |
| 263 | FORCE America | USA | |
| 264 | Northland-Willette | USA | |
| 265 | Ratermann Manufacturing Inc. | USA | |
| 266 | BioAutomation | USA | |
| 267 | Newport Scientific Inc. | USA | |
| 268 | Suttner America Company Ltd. | USA | |
| 269 | TPC Pneumatics | USA | |
| 270 | Highfield Mfg. Co. | USA | |
| 271 | Hengda Filter Press | USA | |
| 272 | ValvTechnologies Inc. | USA | |
| 273 | Kepner Products Co. | USA | |
| 274 | Madden Engineered Products LLC | USA | |
| 275 | Northman Fluid Power | USA | |
| 276 | RA Ross | USA | |
| 277 | Welker Inc. | USA | |
| 278 | Pneumatech | USA | |
| 279 | Velan Inc. | USA | |
| 280 | Anchor Text | USA | |
| 281 | Unique Systems Inc. | USA | |
| 282 | Eaton Crouse-Hinds Division | USA | |
| 283 | High Pressure Technologies LLC | USA | |
| 284 | Air & Hydraulic Equipment Inc. | USA | |
| 285 | Atlantic Hydraulic Systems | USA | |
| 286 | OCS Process Systems | USA | |
| 287 | Malema Engineering Corporation | USA | |
| 288 | Valve Check Inc. | USA | |
| 289 | API International | USA | |
| 290 | Precise Equipment Company | USA | |
| 291 | Buhler Technologies LLC | USA | |
| 292 | Dynex/Rivett Inc. | USA | |
| 293 | Interface Devices Inc. | USA | |
| 294 | Hawe-Group | USA | |
| 295 | Simtech Process Systems | USA | |
| 296 | RegO | USA | |
| 297 | ERL Inc. | USA | |
| 298 | Cla-Val Co. | USA | |
| 299 | GA Industries Inc. | USA | |
| 300 | DuctileIronPiping.Com | USA | |
| 301 | OPS Wireless | USA | |
| 302 | American Vacuum Co. | USA | |
| 303 | Maney Aircraft Inc. | USA | |
| 304 | Chart Industries | USA | |
| 305 | Singer Valve Inc. | USA | |
| 306 | Anchor Text | USA | |
| 307 | Satterlund Supply Co. | USA | |
| 308 | Hunt Valve Company Inc | USA | |
| 309 | Cobra | USA | |
| 310 | Zinga Industries Inc. | USA | |
| 311 | Industrial Supply & Rental | USA | |
| 312 | Buyers Products Company | USA | |
| 313 | United Brass Works Inc. | USA | |
| 314 | Controls Southeast Inc. | USA | |
| 315 | Triad Process Equipment | USA | |
| 316 | Ford Regulator Valve Corp. | USA | |
| 317 | DeWallace Technical | USA | |
| 318 | C.I. Thornburg Co. Inc. | USA | |
| 319 | Neptech Inc. | USA | |
| 320 | GNY Equipment Inc. | USA | |
| 321 | Marotta Controls Inc. | USA | |
| 322 | Wojanis Hydraulic Supply Company Inc. | USA | |
| 323 | Val-Matic Valve Manufacturing Corporation | USA | |
| 324 | MICO Inc. | USA | |
| 325 | National Liftgate Parts Inc. | USA | |
| 326 | Sizto Tech Corp. - STC Valve | USA | |
| 327 | Ham-Let USA Inc | USA | |
| 328 | Jaybell Control Products Ltd | USA | |
| 329 | Red Valve Co./Tideflex Technologies | USA | |
| 330 | Stanford Mu Corporation | USA | |
| 331 | LDI Industries Inc. | USA | |
| 332 | Anchor Text | USA | |
| 333 | Kleenrite Equipment | USA | |
| 334 | Welch Vacuum | USA | |
| 335 | Watts Water Technologies Inc. | USA | |
| 336 | JM Eagle | USA | |
| 337 | Harwood Engineering Co. Inc. | USA | |
| 338 | Smart Products USA Inc. | USA | |
| 339 | Webster Fuel Pumps & Valves | USA | |
| 340 | Trillium Flow Technologies | USA | |
| 341 | RG Group | USA | |
| 342 | Kissler & Co. | USA | |
| 343 | Tacmina USA | USA | |
| 344 | Northcoast Valve & Gate Inc. | USA | |
| 345 | FW Murphy | USA | |
| 346 | Bailey Valve Inc. | USA | |
| 347 | Cross Manufacturing Inc. | USA | |
| 348 | SPX Hydraulic Technologies | USA | |
| 349 | Top Line Process Equipment Co. | USA | |
| 350 | Mazzei Injector Company LLC | USA | |
| 351 | Ellis/Kuhnke Controls | USA | |
| 352 | Burkert Fluid Control Systems | USA | |
| 353 | Rotarex | USA | |
| 354 | U.S. Valve LLC | USA | |
| 355 | IMI Critical Engineering | USA | |
| 356 | Hy-Lok USA | USA | |
| 357 | Fire-End & Croker Corp. | USA | |
| 358 | Anchor Text | USA | |
| 359 | IMI Hydronic Engineering Inc. | USA | |
| 360 | Nacom Flow Controls Inc. | USA | |
| 361 | Brass Aluminum Forging Enterprises | USA | |
| 362 | Reliance Worldwide Corporation | USA | |
| 363 | Bell & Gossett | USA | |
| 364 | Advanced Fluid Power Inc. | USA | |
| 365 | Bachman Valve Corp. | USA | |
| 366 | John J. Steuby Co. | USA | |
| 367 | TR Engineering Inc. | USA | |
| 368 | Watson McDaniel Co. | USA | |
| 369 | Circor Aerospace Inc. / Aerodyne Controls | USA | |
| 370 | Midwest Meter Inc. | USA | |
| 371 | Hydronit Americas Inc. | USA | |
| 372 | Nutek Aerospace Corporation | USA | |
| 373 | RAM-PAC International Inc. | USA | |
| 374 | Condon MFG CO Inc | USA | |
| 375 | Tantaline | USA | |
| 376 | Anver Corp. | USA | |
| 377 | PSG - A Dover Company | USA | |
| 378 | Girard Equipment Inc. | USA | |
| 379 | Fujikura Composites Inc. (Control Equipment Division) | USA | |
| 380 | Richway Industries Ltd. | USA | |
| 381 | Master Pneumatic-Detroit Inc. | USA | |
| 382 | D & D Instruments | USA | |
| 383 | A & E Hand Tools | USA | |
| 384 | Anchor Text | USA | |
| 385 | Dynamic Air Inc. | USA | |
| 386 | Total Valve Systems Inc. | USA | |
| 387 | Westfield Hydraulics Inc. | USA | |
| 388 | Valcor Engineering Corporation | USA | |
| 389 | Mercer Valve Co. Inc. | USA | |
| 390 | Moroso Performance Products | USA | |
| 391 | Flow Products Inc. | USA | |
| 392 | Pneuline Supply Inc. | USA | |
| 393 | BULK TANK INC. | USA | |
| 394 | Crane CPE | USA | |
| 395 | Lube USA | USA | |
| 396 | General Water Systems | USA | |
| 397 | Cole-Parmer | USA | |
| 398 | High Pressure Equipment Co. | USA | |
| 399 | Chalmers & Kubeck | USA | |
| 400 | WITT Gas Controls LP | USA | |
| 401 | Annovi Reverberi (AR) North America Inc. | USA | |
| 402 | Grover Manufacturing Corp. | USA | |
| 403 | Deca Vibrator Industries Inc. | USA | |
| 404 | Circor International Inc. | USA | |
| 405 | OCECO Inc. | USA | |
| 406 | Armco Compressor Products | USA | |
| 407 | Sensus | USA | |
| 408 | IEP Technologies LLC | USA | |
| 409 | Peabody Engineering & Supply Inc. | USA | |
| 410 | Anchor Text | USA | |
| 411 | Hydrasearch Defense | USA | |
| 412 | Cash Acme | USA | |
| 413 | Alfa Laval Inc. | USA | |
| 414 | Swanson Industries Inc. | USA | |
| 415 | Compressor Engineering Corp. (CECO) | USA | |
| 416 | SMC Corporation of America | USA | |
| 417 | Nachi America Inc. | USA | |
| 418 | ARI-Armaturen USA LP | USA | |
| 419 | Lourdes Industries Inc. | USA | |
| 420 | Pulsafeeder Inc | USA | |
| 421 | The Droitcour Company | USA | |
| 422 | Hotsy of Southern California | USA | |
| 423 | Travaini Pumps USA Inc. | USA | |
| 424 | Telematic Controls Inc. | USA | |
| 425 | Qualitrol Company | USA | |
| 426 | C & C Boiler Sales & Service Inc. | USA | |
| 427 | QP Hydraulics | USA | |
| 428 | SVF Flow Controls | USA | |
| 429 | VACCO Industries | USA | |
| 430 | Certified Power Inc. | USA | |
| 431 | Curtiss-Wright Flow Control | USA | |
| 432 | Titan Fittings | USA | |
| 433 | Carr Lane Roemheld Mfg. Co. | USA | |
| 434 | Trionic Corp | USA | |
| 435 | IAC - Industrial Accessories Company | USA | |
| 436 | Anchor Text | USA | |
| 437 | Maedler North America | USA | |
| 438 | Drytech Incorporated | USA | |
| 439 | Doering Company | USA | |
| 440 | Brehob Corporation | USA | |
| 441 | Airtrol Components Inc. | USA | |
| 442 | Beswick Engineering Co. Inc. | USA | |
| 443 | Pacific Bay Equipment - Formerly Hosty Pacific | USA | |
| 444 | Diffused Gas Technologies Inc. | USA | |
| 445 | Varna Products LLC. | USA | |
| 446 | Westmoor Ltd. Industrial Div. | USA | |
| 447 | Ningbo Dino-Power Machinery Co. Ltd. | USA | |
| 448 | Steel & O'Brien Manufacturing | USA | |
| 449 | Carlisle Fluid Technologies | USA | |
| 450 | Emerson Automation Solutions Final Control US LP | USA | |
| 451 | BKO Technical | USA | |
| 452 | Viega LLC | USA | |
| 453 | Dk-Lok U.S.A. | USA | |
| 454 | Argco | USA | |
| 455 | Saint-Gobain Life Sciences | USA | |
| 456 | Western Enterprises | USA | |
| 457 | Crane Instrumentation & Sampling PFT Corp. | USA | |
| 458 | Kleen Blast | USA | |
| 459 | Kennedy Valve | USA | |
| 460 | Macomber Cryogenics Inc. | USA | |
| 461 | Mueller Streamline Co. | USA | |
| 462 | Anchor Text | USA | |
| 463 | Indeck Power Equipment Co. | USA | |
| 464 | ThermOmegaTech Inc. | USA | |
| 465 | World Wide Metric Inc. | USA | |
| 466 | Oil-Rite Corporation | USA | |
| 467 | McGill Hose & Coupling Inc. | USA | |
| 468 | Advanced Fluid Systems Inc. | USA | |
| 469 | Industrial Specialties Mfg. Inc. | USA | |
| 470 | Petersen Products Co. | USA | |
| 471 | SUPERLOK USA | USA | |
| 472 | Orr & Orr Inc. | USA | |
| 473 | Century Instrument Co. | USA | |
| 474 | Haskel International | USA | |
| 475 | Alfa Laval Inc. (US) | USA | |
| 476 | Creative Composites Group | USA | |
| 477 | HYSECO Inc. | USA | |
| 478 | Robeck Fluid Power Co. | USA | |
| 479 | Jensen Inert Products | USA | |
| 480 | Kelly Pneumatics Inc. | USA | |
| 481 | Oasis Manufacturing | USA | |
| 482 | Schutte & Koerting | USA | |
| 483 | Air Logic | USA | |
| 484 | E-Motion Inc. | USA | |
| 485 | Clippard | USA | |
| 486 | Cipriani Harrison Valves Corp. | USA | |
| 487 | Hayward Flow Control | USA | |
| 488 | Anchor Text | USA | |
| 489 | SSP Fittings Corp. | USA | |
| 490 | The Lee Company | USA | |
| 491 | Emerson Automation Solutions Regulators and Relief Valves | USA | |
| 492 | MAXPRO Technologies Inc. | USA | |
| 493 | ASC Engineered Solutions | USA | |
| 494 | Swagelok Company | USA | |
| 495 | Parker / Autoclave Engineers | USA | |
| 496 | Aquatrol Inc. | USA | |
| 497 | Parker Hannifin Instrumentation Products Div. | USA | |
| 498 | Aqua Environment Co. Inc. | USA | |
| 499 | Plast-O-Matic Valves Inc. | USA | |
| 500 | Dunham Rubber & Belting Corp. | USA | |
| 501 | Xylem Inc. | USA | |
| 502 | Magnatrol Valve Corp. | USA | |
| 503 | Liberty Industries Inc. | USA | |
| 504 | Asahi/America Inc. | USA | |
| 505 | RED-WHITE VALVE CORP. | USA | |
| 506 | International Polymer Solutions (iPolymer) | USA | |
| 507 | Metraflex Co. | USA | |
| 508 | The Kraissl Co. Inc. | USA | |
| 509 | Lumaco | USA | |
| 510 | Check All Valve Manufacturing Co. | USA | |
| 511 | Sutton-Garten Co. | USA | |
| 512 | HYDAC Technology Corporation | USA | |
| 513 | Stephens Mfg. Co. Inc. | USA | |
| 514 | Anchor Text | USA | |
| 515 | Hawthorne Spring Co. | USA | |
| 516 | Peripheral Computer Systems Inc. | USA | |
| 517 | Fisher Controls International Inc. | USA | |
| 518 | Berg-Dorf Pipe & Supply | USA | |
| 519 | Rockwood Swendeman LLC | USA | |
| 520 | Brass Craft Western Co. | USA | |
| 521 | Mohawk Valve Co. | USA | |
| 522 | Ironmaster Corp. | USA | |
| 523 | Weatherford U.S. Inc. | USA | |
| 524 | Clendenning J. R. Co. | USA | |
| 525 | Michigan Instruments & Control | USA | |
| 526 | CAC Inc. | USA | |
| 527 | Ralbo Inc. | USA | |
| 528 | Schrupp | USA | |
| 529 | Goldner Herman Co. Inc. | USA | |
| 530 | Red Valve Co. Inc. | USA | |
| 531 | Western States Oilfield Products | USA | |
| 532 | VIP Valves | USA | |
| 533 | Northfork Plumbing | USA | |
| 534 | Kadant Aes | USA | |
| 535 | American National Can Co. | USA | |
| 536 | Enpro Systems Inc. | USA | |
| 537 | I.W. Sales Inc. | USA | |
| 538 | Poweraire | USA | |
| 539 | Roll Seal Valve Co. Inc. The | USA |
