Major Overhaul Kit – Pfeiffer Duo 35

The Duo 35 is a two-stage rotary vane pump. It is the standard version (with a traditional shaft seal) of this pump series. Here are its key features:

• Pumping speed – Up to 35 m³/h

• Ultimate pressure – < 3 x 10⁻³ hPa (with gas ballast off)

• Oil capacity – Approximately 2.5 liters

• Two-stage design – Provides a deeper vacuum than single-stage pumps

  This kit includes nearly every wearable part your pump needs. Here is the complete list of what you get:

  Vanes (The Heart of the Pump) – Made of GX Material

  Part Number	Description	Quantity
  230073	Vane, 1st Stage – GX	2
  230072G	Vane, 2nd Stage – GX	2

  Springs

  Part Number	Description	Quantity
  3838132SV	Spring	1
  490059	Spring	1
  490052	Pressure Spring	4

  Seals & O-Rings (Stop All Leaks)

  Part Number	Description	Quantity
  310104	Shaft Seal	2
  300167	Sight Glass Gasket	2
  320210	O-ring, 2.1 x 1 mm – Viton	1
  4070065	O-ring, 5 x 1.5 mm – Viton	2
  4070088	O-ring, 6 x 2.2 mm – Viton	1
  4070166	O-ring, 10 x 2.5 mm – Viton	2
  320332	O-ring, 12 x 1.5 mm – Viton	1
  4070259	O-ring, 15 x 2.5 mm – Viton	2
  4070420	O-ring, 24 x 2.5 mm – Viton	4
  4070465	O-ring, 27 x 2.5 mm – Viton	1
  4070621	O-ring, 38 x 3.0 mm – Viton	1
  900068	O-ring, 40 x 5 mm – Viton	3
  320333	O-ring, 42 x 3 mm – Viton	1
  48655900	O-ring, 44 x 3 mm – Viton	2
  320152	O-ring, 50 x 3 mm – Viton	2
  4070874	O-ring, 59 x 3.0 mm – Viton	1
  91311560300	O-ring, 68 x 3 mm – Viton	1
  320334	O-ring, 78 x 5 mm – Viton	1
  320335	O-ring, 85 x 2.5 mm – Viton	1
  320336	O-ring, 94 x 2.5 mm – Viton	1
  320337	O-ring, 132 x 2.5 mm – Viton	1
  320338	O-ring, 270 x 3 mm – Viton	1

  Valves & Plates (Control the Flow)

  Part Number	Description	Quantity
  380018	Plate Valve	1
  580044	Hydraulic Piston	1
  PL20011245	Exhaust Finger	2
  390014	Stainless Steel Ball, 7 mm	1
  390015	Stainless Steel Ball, 8 mm	1
  640019	Buffer, 30 x 30 x 3.2 mm	4

  Filters & Mechanical Parts

  Part Number	Description	Quantity
  780031	Filter Screen for Oil Pump	1
  780032	Mesh Filter, Sieve	1
  440026	Distance Ring / Disc	1

  Sight Glass

  Part Number	Description	Quantity
  500023	Sight Glass	1