Raydafon M74D Double Mechanical Seal for Chemical Pump

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: Special cast CrMo steel (S), Silicon carbide (Q1, Q2)
Seat G9: Carbon graphite antimony impregnated (A), Carbon graphite resin impregnated (B), Silicon carbide (Q1*, Q2*)
Seat G4: Silicon carbide (Q1*, Q2*)
Seat G6: Silicon carbide (Q1*, Q2*)
Seat G13: Carbon graphite antimony impregnated (A), Carbon graphite resin impregnated (B)
* Cannot be combined with seal face made of S

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

Product variants

M74F-D
Dimensions, items and descriptions as for M74-D, but with pumping screw.
Dependent on direction of rotation. Viscosity ≤ ISO VG10).

Double seal
Unbalanced
Independent of direction of rotation
Multiple springs
Its designed functions are the same as M7 series. Except for the installation dimensions of drive base, the other installation dimensions (d1<100mm) are subject to DIN24960. It is suitable for medium that contain fiber or solids which can easily solidify.
Combination of materials
Sealing face
Graphite, Silicon carbide, Tungsten carbide,Aluminum oxide
Secondary sealing
Acrylonitrile rubber, Fluorine rubber, Ethylene propylene rubber,PTFE
Metal component
Stainless steel
Operating limits
Specification: 18200 mm
Pressure: ≤2.5 Mpa
Temperature: -50220
Linear speed: ≤20m/s
Axial movement:
d1≤ 100 :±0.5 mm
d1 >100 :±2.0 mm