284 part numbers
Welch parts
Grouped by what they do. Each part lists the models it fits, as Welch publishes them.
Fittings and hardware · Rotating parts · Seals and gaskets · Valves · Housing and covers · Filtration · Lubrication · Piston and diaphragm parts · Motor and drive · Kit · Other parts · Cross-reference
Parts drawings on file for 4 of 71 Welch models, parts lists for 4. Work at Welch? Help fill the gaps
Fittings and hardware
73 parts · the 30 fitting the most models shown; search for any other| Part number | Name | Fits | Offers |
|---|---|---|---|
| S3083-99 | Screw | 3 models | - |
| S3089-99 | Screw | 3 models | - |
| S3092-99 | Elastic Washer | 3 models | - |
| S3093-99 | Screw | 3 models | - |
| S3106-99 | Flat Key | 3 models | - |
| S3117-99 | Screw | 3 models | - |
| 705550 | Bottom flange | 2 models | - |
| 822419-1 | Screw A2, M6x14 | 2 models | - |
| 822476 | Screw A2, M4x14 | 2 models | - |
| 824636 | U-Washer A2, 6.4x12.5x1.6 | 2 models | - |
| S3044-99 | Spring | 2 models | - |
| S3085-99 | Screw | 2 models | - |
| S3087-99 | Elastic Washer | 2 models | - |
| S3088-99 | Screw | 2 models | - |
| S3094-99 | Screw | 2 models | - |
| S3100-99 | Screw | 2 models | - |
| S3101-99 | Elastic Washer | 2 models | - |
| S3107-99 | Screw | 2 models | - |
| S3108-99 | Elastic Washer | 2 models | - |
| S3114-99 | Elastic Washer | 2 models | - |
| S3115-99 | Flat Washer | 2 models | - |
| S3120-99 | Flat Washer | 2 models | - |
| S3166-99 | Anti-Suck Back Spring | 2 models | - |
| S3178-99 | Screw | 2 models | - |
| S3179-99 | Elastic Washer | 2 models | - |
| S3180-99 | Screw | 2 models | - |
| 2-00-6712 | SCREW SOCKET HD 10-32 x 3/4” LG. SCREW #6-1/4 SELF TAPPING | 1 model | - |
| 2-01-0114 | SCREW HEX HD 1/4”-20 X 7/8” LG. THRUST DISK | 1 model | - |
| 2-01-0356 | SCREW HEX HD 5/16-18 x 3-1/4”” LG.. PULLEY w/ SET SCREW | 1 model | - |
| 2-31-0112 | HEX NUT 1/4-20, STEEL VALVE SPRING | 1 model | - |
Rotating parts
32 parts · the 30 fitting the most models shown; search for any other| Part number | Name | Fits | Offers |
|---|---|---|---|
| 2-01-5106 | SCREW SOCKET HD 1/4-20 x 3/8” LG. ROTOR, INTAKE | 1 model | - |
| 2-01-6112 | SCREW SOCKET HD 1/4-20 x 3/4” LG. SHAFT | 1 model | - |
| 4-06-0754 | ROTOR CLIP WASHER 5/16 ID x 1/2 OD | 1 model | - |
| 41-0959 | VANE, LARGE WASHER 5/16, COPPER | 1 model | - |
| 41-1304 | VANE SPRING INTAKE RING | 1 model | - |
| 41-1487 | VANE SMALL LARGE END PLATE | 1 model | - |
| 41-1518 | EXHAUST ROTOR COVER, FINISHED | 1 model | - |
| S3003-99 | Coupling | 1 model | - |
| S3025-99 | Coupling | 1 model | - |
| S3032-99 | Oil Pump Rotor(Out) | 1 model | - |
| S3033-99 | Oil Pump Rotor(In) | 1 model | - |
| S3037-99 | Fore Rotor | 1 model | - |
| S3038-99 | Fore Vane | 1 model | - |
| S3043-99 | Back Pump Vane | 1 model | - |
| S3046-99 | Rear Rotor | 1 model | - |
| S3048-99 | Rear Vane | 1 model | - |
| S3123-99 | Pump Fan | 1 model | - |
| S3127-99 | Coupling | 1 model | - |
| S3130-99 | Coupling | 1 model | - |
| S3132-99 | Oil Pump Rotor (out) | 1 model | - |
| S3133-99 | Oil Pump Rotor (in) | 1 model | - |
| S3135-99 | Fore rotor | 1 model | - |
| S3136-99 | Fore Vane | 1 model | - |
| S3141-99 | Rear Rotor | 1 model | - |
| S3142-99 | Rear Vane | 1 model | - |
| S3412-99 | Pump fan | 1 model | - |
| S3435-99 | Coupling | 1 model | - |
| S3443-99 | Oil Pump Rotor(in) | 1 model | - |
| S3444-99 | Oil Pump Rotor(out) | 1 model | - |
| S3460-99 | Back Pump Vane | 1 model | - |
Seals and gaskets
32 parts · the 30 fitting the most models shown; search for any other| Part number | Name | Fits | Offers |
|---|---|---|---|
| S3063-99 | O-Ring | 3 models | - |
| 829290 | O-ring FKM, 84x3 | 2 models | - |
| S3018-99 | O-Ring | 2 models | - |
| S3019-99 | Oil Seal | 2 models | - |
| 41-0234 | GASKET, INTAKE CHAMBER COVER OIL CASE ASSEMBLY | 1 model | - |
| 41-0403 | GASKET, OIL CASE SHAFT SEAL ASSEMBLY | 1 model | - |
| 41-0643 | GASKET, SEAL VALVE BLOCK | 1 model | - |
| 61-9284A | O-RING #214 VITON CENTER PLATE | 1 model | - |
| S3010-99 | O-Ring | 1 model | - |
| S3022-99 | O-Ring | 1 model | - |
| S3027-99 | Oil Seal | 1 model | - |
| S3028-99 | O-Ring | 1 model | - |
| S3030-99 | O-Ring | 1 model | - |
| S3034-99 | Gasket | 1 model | - |
| S3036-99 | Oil Seal | 1 model | - |
| S3059-99 | O-Ring | 1 model | - |
| S3096-99 | O-Ring | 1 model | - |
| S3143-99 | O-Ring | 1 model | - |
| S3155-99 | Gasket | 1 model | - |
| S3156-99 | O-Ring | 1 model | - |
| S3168-99 | O-Ring | 1 model | - |
| S3169-99 | O-ring | 1 model | - |
| S3170-99 | O-ring | 1 model | - |
| S3171-99 | O-Ring | 1 model | - |
| S3172-99 | O-Ring | 1 model | - |
| S3173-99 | Oil Seal | 1 model | - |
| S3176-99 | Oil seal | 1 model | - |
| S3185-99 | O-Ring | 1 model | - |
| S3420-99 | O-ring | 1 model | - |
| S3439-99 | Oil seal TC 25*45*11 | 1 model | - |
Valves
22 parts| Part number | Name | Fits | Offers |
|---|---|---|---|
| S3014-99 | Gas Ballast Valve Ring | 3 models | - |
| S3015-99 | Gas Ballast Knob | 3 models | - |
| S3045-99 | Gas Ballast Valve Head | 2 models | - |
| S3049-99 | Oil Pump Valve | 2 models | - |
| S3163-99 | Gas Ballast Location Bush | 2 models | - |
| 2-00-2706 | SCREW PAN HD 10-32 x 3/8” LG. GAS BALLAST VALVE | 1 model | - |
| 2-01-6320 | SCREW SOCKET HD 5/16-18 x 1-1/4”” EXHAUST VALVE, UPPER | 1 model | - |
| 2-01-8123 | SETSCREW 1/4-20 X 1-3/4” LG. EXHAUST VALVE, LOWER | 1 model | - |
| 2-36-9900 | VALVE BLOCK SPACER | 1 model | - |
| 41-0992 | PRESSURE RELEASE VALVE HOSE ADAPTER 13/16” HOSE ID | 1 model | - |
| S3011-99 | Gas Ballast Valve Bush | 1 model | - |
| S3012-99 | Gas Ballast Valve Rod | 1 model | - |
| S3013-99 | Gas Ballast Location Bush | 1 model | - |
| S3042-99 | Exhaust Valve Plate | 1 model | - |
| S3146-99 | Exhaust Valve Plate | 1 model | - |
| S3160-99 | Gas Ballast Valve Bush | 1 model | - |
| S3161-99 | Gas Ballast Valve Rod | 1 model | - |
| S3298-99 | short gas ballast mouth | 1 model | - |
| S3300-99 | Gas ballast valve bush | 1 model | - |
| S3432-99 | Long gas ballast mouth | 1 model | - |
| S3449-99 | Exhaust Valve Plate | 1 model | - |
| S3471-99 | Oil Pump Valve | 1 model | - |
Housing and covers
20 parts| Part number | Name | Fits | Offers |
|---|---|---|---|
| S3008-99 | Foot Pad | 3 models | - |
| 705548-06 | Clamping cover | 2 models | - |
| S3164-99 | Anti-Suck Back Cover | 2 models | - |
| 2-01-0316 | SCREW HEX HD 5/16-18 x 1” LG. SMALL END PLATE, FINISHED | 1 model | - |
| S3007-99 | Base | 1 model | - |
| S3020-99 | Anti-Suck Back Cover | 1 model | - |
| S3026-99 | Pump Cover | 1 model | - |
| S3035-99 | Fore Stator | 1 model | - |
| S3040-99 | Oil-Proofing Cover | 1 model | - |
| S3050-99 | Rear Cover | 1 model | - |
| S3122-99 | Base | 1 model | - |
| S3131-99 | Pump Cover | 1 model | - |
| S3134-99 | Fore Stator | 1 model | - |
| S3137-99 | Rear Stator | 1 model | - |
| S3138-99 | Rear Cover | 1 model | - |
| S3148-99 | Oil cover | 1 model | - |
| S3417-99 | Base | 1 model | - |
| S3441-99 | Pump Cover | 1 model | - |
| S3461-99 | Oil-proofing cover | 1 model | - |
| S3464-99 | Rear cover | 1 model | - |
Filtration
15 parts| Part number | Name | Fits | Offers |
|---|---|---|---|
| S3109-99 | Filter | 2 models | - |
| 41-0660 | INTAKE SCREEN VALVE | 1 model | - |
| 41-0672 | SHAFT END PLATE BRACKET, INTAKE SCREEN | 1 model | - |
| 700146 | PT40 separator to prevent the suction of condensates. Large collection capacity with sight glass for level monitoring | 1 model | - |
| 700436 | ASF70 dust filter – For non-chemical application only | 1 model | - |
| 700623 | OME85/40 Exhaust oil mist filter – With surface treatment for corrosion resistance | 1 model | - |
| S3009-99 | Felt | 1 model | - |
| S3024-99 | Coupling Element | 1 model | - |
| S3095-99 | Filter | 1 model | - |
| S3128-99 | Coupling Element | 1 model | - |
| S3157-99 | Filter | 1 model | - |
| S3207-99 | Felt | 1 model | - |
| S3414-99 | Coupling Element | 1 model | - |
| S3419-99 | Felt | 1 model | - |
| S3426-99 | KF40 Filter | 1 model | - |
Lubrication
14 parts| Part number | Name | Fits | Offers |
|---|---|---|---|
| S3056-99 | Oil Fill Plug | 3 models | - |
| S3062-99 | Oil Drain Plug | 3 models | - |
| 705185 | ADT40 fine vacuum adsorption trap. With a very high affinity to Hydrocarbons to eliminate oil back-streaming | 1 model | - |
| 800131-01 | Labovac 13, PFPE oil, 1 liter | 1 model | - |
| 800995-05 | Premium vacuum pump oil, 5 liter | 1 model | - |
| 800995-20 | Premium vacuum pump oil, 20 liters | 1 model | - |
| 800995-200 | Premium vacuum pump oil, 200 liters | 1 model | - |
| S3058-99 | Oil Casing | 1 model | - |
| S3061-99 | Oil Window | 1 model | - |
| S3140-99 | Oil Case | 1 model | - |
| S3145-99 | Oil Window | 1 model | - |
| S3152-99 | Oil Plate | 1 model | - |
| S3473-99 | Oil casing | 1 model | - |
| S3478-99 | Oil window | 1 model | - |
Piston and diaphragm parts
3 partsMotor and drive
1 part| Part number | Name | Fits | Offers |
|---|---|---|---|
| S3001-99 | Motor | 1 model | - |
Other parts
71 parts · the 30 fitting the most models shown; search for any other| Part number | Name | Fits | Offers |
|---|---|---|---|
| 705549 | Wire mesh | 2 models | - |
| 800200 | Molecular sieve (sorption agent 1l) | 2 models | - |
| S3021-99 | Anti-Suck Back Plate | 2 models | - |
| S3002-99 | Handle | 1 model | - |
| S3004-99 | Red Strip | 1 model | - |
| S3005-99 | Side Overlay | 1 model | - |
| S3006-99 | Trestle | 1 model | - |
| S3023-99 | Inlet Port | 1 model | - |
| S3031-99 | Bush | 1 model | - |
| S3041-99 | Limiting Plate | 1 model | - |
| S3053-99 | Flap | 1 model | - |
| S3054-99 | Exhaust Port | 1 model | - |
| S3060-99 | Glass | 1 model | - |
| S3097-99 | Rubber Sheet | 1 model | - |
| S3099-99 | Hoop | 1 model | - |
| S3116-99 | Centre Rest | 1 model | - |
| S3124-99 | Trestle | 1 model | - |
| S3125-99 | Side Overlay | 1 model | - |
| S3126-99 | Red Strip | 1 model | - |
| S3144-99 | Glass | 1 model | - |
| S3147-99 | Limiting Plate | 1 model | - |
| S3150-99 | Exhaust Port | 1 model | - |
| S3153-99 | Bush | 1 model | - |
| S3158-99 | Inlet Port | 1 model | - |
| S3174-99 | Hoop | 1 model | - |
| S3175-99 | Centre Rest | 1 model | - |
| S3208-99 | Ring | 1 model | - |
| S3209-99 | Rubber Sheet | 1 model | - |
| S3297-99 | Spacer | 1 model | - |
| S3301-99 | pressing plate | 1 model | - |