M74-D Pusher Seals - Mechanical Seals For Pumps

Product Detail

Item	Part no. to DIN 24250	Description
1.1	472.1	Seal face
1.2	472.2	Seal face
1.3	474	Thrust ring
1.4	485	Drive collar
1.5	477	Spring
1.6	904	Set screw
1.7	412.1	O-Ring
1.8	412.2	O-Ring
2	475.1	Seat (G9)
3	412.3	O-Ring
4	475.2	Seat (G9)
5	412.4	O-Ring

1) d1 > 100 mm: 30°
2) d1 > 100 mm: +0.1
3) d1 > 100 mm: H7




Features

• For plain shafts
• Dual seal
• Unbalanced
• Rotating multiple springs
• Independent of direction of rotation
• Seal concept based on the M7 range
• Variant with pumping screw available (M74F-D)

Advantages

• Efficient stock keeping due to easily interchangeable faces
• Extended selection of materials
• Flexibility in torque transmissions
• EN 12756 (For connection dimensions d₁ up to      100 mm (3.94"))

Operating range

Shaft diameter:
d1 = 18 ... 200 mm (0.71" … 7.87")
Pressure:
p1 = 25 bar (363 PSI)
Temperature:
t = -50 °C ... 220 °C
(-58 °F … 428 °F)
Sliding velocity:
vg = 20 m/s (66 ft/s)
Axial movement:
d1 up to 100 mm: ±0.5 mm
d1 from 100 mm: ±2.0 mm

Materials

Seal face: Silicon carbide (Q1)
Seat G9: Carbon graphite antimony impregnated (A), Carbon graphite resin impregnated (B), Silicon carbide (Q1)
Seat G4, G6 (Q1, Q2), Seat G13 (A, B)

Secondary seals: EPDM (E), FKM (V), FFKM (K)
Springs: CrNiMo steel (G)
Metal parts: CrNiMo steel (G), Duplex (G1)

Standards and approvals

• EN 12756

Recommended applications

• Chemical industry
• Process industry
• Pulp and paper industry
• Low solids content and low abrasive media
• Toxic and hazardous media
• Media with poor lubrication properties
• Adhesives

Chemical standard pumps