Welch · DuoSeal 1405

DuoSeal 1405

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Oil-Lubricated Rotary VaneOEM data

Image: Welch

Ultimate pressure: 0.0013 mbar
Weight: 59.9 kg

Headline ratings converted to common units for comparison; the table below shows each figure exactly as published.

Technical data

Source: Welch product page · retrieved 2026-10-02

As published	Value	as printed: "Weight"; 60 kg	as printed: "Motor Power \| HP (kW) at 60 Hz"; 0.37 kW
Ultimate vacuum Ultimate pressure	<0.001 Torr Torr oem source Source · 2026-10-02
Weight		132 lbs oem source Source · 2026-10-20
Motor power			1/2 /2 HP oem source Source · 2026-10-20

Original extracted values are shown with their source and review status. Multiple values under the same condition remain separate for review.

Explore the parts

DuoSeal 1405, pulled apart

This model’s parts, by where they sit

Our drawing of the machine type, with the DuoSeal 1405's own parts from Welch's lists. Side view along the shaft. Oil-free (dry) pumps have no exhaust box oil, sight glass or oil filter; their exhaust filter is a dust filter.

Reviewed operating performance · 60 Hz

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Documents

duoseal 1405 manualmanual · 28 pp

Documents open on the manufacturer’s site.

Service parts · 30

Seals and gaskets4

Rotating parts7

Fittings and hardware11

Filtration2

Valves5

Housing and covers1

SCREW HEX HD 5/16-18 x 1” LG. SMALL END PLATE, FINISHED2-01-0316

Part numbers from Welch’s parts lists, shop and instruction manuals. Open a part for its other models, replacements and suppliers.

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Parts diagrams

Exploded views from Welch’s own documents, with each position and part number as printed. Select a part to see what it fits, who sells it and what replaces it.

Section 8: exploded view · duoseal 1405 manual, page 1630 positions

The positions on this drawing haven’t been placed yet: choose a position in the list for its part. Drag to move, pinch or Ctrl + scroll to zoom.

Select a part on the drawing or in the list to see its number, what it fits and where to get it. Turn on “select several” to build one quote for many parts.

Select several

Pos.	Part number	Description	Qty
	2-00-2706	SCREW PAN HD 10-32 x 3/8” LG. GAS BALLAST VALVE
	2-00-6712	SCREW SOCKET HD 10-32 x 3/4” LG. SCREW #6-1/4 SELF TAPPING
	2-01-0114	SCREW HEX HD 1/4”-20 X 7/8” LG. THRUST DISK
	2-01-0316	SCREW HEX HD 5/16-18 x 1” LG. SMALL END PLATE, FINISHED
	2-01-0356	SCREW HEX HD 5/16-18 x 3-1/4”” LG.. PULLEY w/ SET SCREW
	2-01-5106	SCREW SOCKET HD 1/4-20 x 3/8” LG. ROTOR, INTAKE
	2-01-6112	SCREW SOCKET HD 1/4-20 x 3/4” LG. SHAFT
	2-01-6320	SCREW SOCKET HD 5/16-18 x 1-1/4”” EXHAUST VALVE, UPPER
	2-01-8123	SETSCREW 1/4-20 X 1-3/4” LG. EXHAUST VALVE, LOWER
	2-31-0112	HEX NUT 1/4-20, STEEL VALVE SPRING
	2-36-9900	VALVE BLOCK SPACER
	2-61-0000	WASHER, STEEL 3/16 BAFFLE ASSEMBLY
	2-63-0193	WASHER, LOCK 1/4” MEDIUM SETSCREW 1/4-20 x 2.25” LG
	4-06-0754	ROTOR CLIP WASHER 5/16 ID x 1/2 OD
	4-40-1200	STEEL BALL 3/8” DIA. LOCK NUT
	41-0234	GASKET, INTAKE CHAMBER COVER OIL CASE ASSEMBLY
	41-0403	GASKET, OIL CASE SHAFT SEAL ASSEMBLY
	41-0508	WASHER, THRUST EXHAUST RING
	61-9284A	O-RING #214 VITON CENTER PLATE
	41-0613	WOODRUFF KEY #404 PRESSURE RELEASE TUBE #1
	41-0624	WOODRUFF KEY PRESSURE RELEASE TUBE #2
	41-0643	GASKET, SEAL VALVE BLOCK
	41-0660	INTAKE SCREEN VALVE
	41-0672	SHAFT END PLATE BRACKET, INTAKE SCREEN
	41-0959	VANE, LARGE WASHER 5/16, COPPER
	41-0992	PRESSURE RELEASE VALVE HOSE ADAPTER 13/16” HOSE ID
	41-1304	VANE SPRING INTAKE RING
	41-1487	VANE SMALL LARGE END PLATE
	41-1518	EXHAUST ROTOR COVER, FINISHED
	41-1685	SPRING HOLDER EXHAUST PLUG , LARGE

Positions and part numbers as printed in Welch’s duoseal 1405 manual, page 16 · view the source document