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  1. SMC
  2. Welch
  3. Chemical Duty Diaphragm Vacuum Pumps and Systems

Chemical Duty Diaphragm Vacuum Pumps and Systems

Clean operation (oil free), low cost of ownership, highest reliability “ these are just a few benefits that customers can appreciate when they use a diaphragm pump for laboratory or industrial applications. With a broad range of diaphragm pumps “ ultimate vacuum from 75 to 1 mbar and peak flow rates up to 138 l/min “ Welch offers specific pump families and models for a variety of uses.


Diaphragm pumps work completely without oil which has several advantages for the user:

  • Less maintenance compared to other technologies saves time and money
  • Dry vacuum allows cleaner workplace and environment
  • Uncontaminated pumping of gases results in cleaner samples and no risk of oil back-streaming


Overview of Welch Diaphragm Pump Families

DryFast BTpro
Self-Cleaners
High-Capacity
XPRF
Free Air Displacement, cfm
0.9 to 2.5 1.4 to 6 1.2 2.3 to 7.8 4.5 to 6.9
Ultimate Vacuum, torr 40 to 9
15 to 6
9 to 2
56 to 1.5 100 to 25
Chemical Resistant? Yes
Yes
Yes
Yes
Yes
Self-Cleaning Feature? No
No
Yes
No
No
Tunable Vacuum? Yes Select Models Yes
No
No
Explosion-Proof Motor?
No No
No
No
Yes
Chemical Duty Diaphragm Vacuum Pumps and Systems subcategories
  • BTpro
  • Dryfast
  • Explosion Proof Motor
  • High Capacity
  • Self Cleaners
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Products [26]

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Welch Self Cleaning Vacuum System 2025 - 202501: SELF CLEANING DRY VACUUM SYSTEM 115V/60HZ,CSA
Welch Self Cleaning Vacuum System 2025 - 202501: SELF CLEANING DRY VACUUM SYSTEM 115V/60HZ,CSA
Your Price: $4,860.00

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Welch Self Cleaning Vacuum System 2026 - 202601: SELF CLEANING DRY VACUUM SYSTEM 115V/60HZ,(2 TORR)
Welch Self Cleaning Vacuum System 2026 - 202601: SELF CLEANING DRY VACUUM SYSTEM 115V/60HZ,(2 TORR)
Your Price: $5,727.00

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Welch Self Cleaning Vacuum System 2027 - 202701: SELF CLEANING DRY VACUUM SYSTEM 115V/60HZ,(DIGI)
Welch Self Cleaning Vacuum System 2027 - 202701: SELF CLEANING DRY VACUUM SYSTEM 115V/60HZ,(DIGI)
Your Price: $6,094.00

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Welch Self Cleaning Vacuum System 2028 - 202801: SELF CLEANING DRY VACUUM SYSTEM, Programmable
Welch Self Cleaning Vacuum System 2028 - 202801: SELF CLEANING DRY VACUUM SYSTEM, Programmable
Your Price: $7,696.00

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Welch DryFast Collegiate Diaphragm Pump 2014 - 2014 DRYFAST 115V, 60HZ, 25LPM, 40TORR
Welch DryFast Collegiate Diaphragm Pump 2014 - 2014 DRYFAST 115V, 60HZ, 25LPM, 40TORR
Your Price: $2,091.00
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Welch DryFast Ultra Diaphragm Pump 2032 - DRY PUMP / DRYFAST ULTRA 2 TORR, 25 LPM
Welch DryFast Ultra Diaphragm Pump 2032 - DRY PUMP / DRYFAST ULTRA 2 TORR, 25 LPM
Your Price: $4,229.00

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Welch DryFast Diaphragm Pump 2034 - DRY PUMP / DRYFAST 9 TORR, 25 LPM
Welch DryFast Diaphragm Pump 2034 - DRY PUMP / DRYFAST 9 TORR, 25 LPM
Your Price: $2,969.00

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Welch DryFast Diaphragm Pump 2037 - 2037 DRY PUMP / DRYFAST 35 TORR, 50 LPM
Welch DryFast Diaphragm Pump 2037 - 2037 DRY PUMP / DRYFAST 35 TORR, 50 LPM
Your Price: $3,257.00

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Welch DryFast Diaphragm Pump 2042 - DRY PUMP / DRYFAST ULTRA 2 TORR, 35 LPM, 115V
Welch DryFast Diaphragm Pump 2042 - DRY PUMP / DRYFAST ULTRA 2 TORR, 35 LPM, 115V
Your Price: $4,755.00

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Welch DryFast Diaphragm Pump 2044 - DRY PUMP / DRYFAST 9 TORR, 35 LPM
Welch DryFast Diaphragm Pump 2044 - DRY PUMP / DRYFAST 9 TORR, 35 LPM
Your Price: $3,441.00

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Welch DryFast Diaphragm Pump 2047 - DRY PUMP / DRYFAST 35 TORR, 70 LPM
Welch DryFast Diaphragm Pump 2047 - DRY PUMP / DRYFAST 35 TORR, 70 LPM
Your Price: $3,836.00

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Welch High Capacity 2052 - PTFE PUMP 115V 60/50HZ 1.5 TORR 65 LPM
Welch High Capacity 2052 - PTFE PUMP 115V 60/50HZ 1.5 TORR 65 LPM
Your Price: $5,490.00

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Welch High Capacity 2054 - PTFE PUMP 115V 60/50HZ 6 TORR 100 LPM
Welch High Capacity 2054 - PTFE PUMP 115V 60/50HZ 6 TORR 100 LPM
Your Price: $6,002.00

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Welch High Capacity 2062 - PTFE PUMP 115V 60HZ 1.5 TORR 119 LPM
Welch High Capacity 2062 - PTFE PUMP 115V 60HZ 1.5 TORR 119 LPM
Your Price: $7,387.00

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Welch High Capacity 2064 - PTFE PUMP 115V 60HZ 6 TORR 174 LPM
Welch High Capacity 2064 - PTFE PUMP 115V 60HZ 6 TORR 174 LPM
Your Price: $7,449.80

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Welch High Capacity 2067 - PTFE PUMP 115V 60HZ 56 TORR 221 LPM
Welch High Capacity 2067 - PTFE PUMP 115V 60HZ 56 TORR 221 LPM
Your Price: $6,904.00

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Welch Diaphragm Pump with Explosion Proof Motor 2085 - 2085 1-stage Vacuum Pump with Explosion Proof Motor
Welch Diaphragm Pump with Explosion Proof Motor 2085 - 2085 1-stage Vacuum Pump with Explosion Proof Motor
Your Price: $8,038.00
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Welch Diaphragm Pump with Explosion Proof Motor 2090 - 2090 2-stage Vacuum Pump with Explosion Proof Motor
Welch Diaphragm Pump with Explosion Proof Motor 2090 - 2090 2-stage Vacuum Pump with Explosion Proof Motor
Your Price: $7,880.00
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Welch BTpro 40 Diaphragm Pump - BT-40 VAC PUMP 15 TORR 40 LPM
Welch BTpro 40 Diaphragm Pump - BT-40 VAC PUMP 15 TORR 40 LPM
Your Price: $1,805.00

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Welch BTpro 70 Diaphragm Pump - BT-70 VAC PUMP 15 TORR 70 LPM
Welch BTpro 70 Diaphragm Pump - BT-70 VAC PUMP 15 TORR 70 LPM
Your Price: $3,350.00
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Welch BTpro 100 Diaphragm Pump with cUL - BTpro 100, 115V  PTFE diaphragm pump
Welch BTpro 100 Diaphragm Pump with cUL - BTpro 100, 115V PTFE diaphragm pump
Your Price: $5,045.00

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Welch BTpro 170 Diaphragm Pump with cUL - BTpro 170, 115V  PTFE diaphragm pump
Welch BTpro 170 Diaphragm Pump with cUL - BTpro 170, 115V PTFE diaphragm pump
Your Price: $5,240.00
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Welch 2040B-01 - DryFast Ultra Plus ™ Chemical Duty Dry Diaphragm Pump
Welch 2040B-01 - DryFast Ultra Plus ™ Chemical Duty Dry Diaphragm Pump
Your Price: $5,359.00
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2042C-02N Welch PTFE Diaphragm Vacuum Pump V-230 Hz50
2042C-02N Welch PTFE Diaphragm Vacuum Pump V-230 Hz50
Your Price: $4,115.00

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2045C-02N Welch Chemical Duty Dry Vacuum Pump
2045C-02N Welch Chemical Duty Dry Vacuum Pump
Your Price: $3,485.00

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116051-11 Welch LVSF600T-ATEX115v
116051-11 Welch LVSF600T-ATEX115v
Your Price: $6,930.00

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Orange Coast Pneumatics, Inc., 3810 Prospect Ave., Unit A. Yorba Linda, CA 92886, Phone number : 714-312-5531, Business contact hours: 9 am - 5 pm, sales@ocaire.com
SMCPneumatics.com is brought to you by Orange Coast Pneumatics, Inc. an authorized national elite distributor for the SMC Corporation of America.
SMC Pneumatics, SMCEtech, Etech, SMC Now and SMC USA are marks currently or in the past used by the SMC Corporation of America. We have no affiliation with Air Logic division of Knapp manufacturing. Product selection is the sole responsibility of the user, regardless of any recommendations or suggestions made by the factory or its distributors. The user shall make selections based upon their own analysis and testing with regard to function, material compatibility and product ratings. Proper installation, operation and maintenance are also required to assure safe, trouble free performance.

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