Single Mechanical Seal; Unibloc-Pd 200-275 Single Mechanical Seal Removal; Unibloc-Pd 200-275 Single Mechanical Seal Installation - Unibloc-Pump LABTOP 200 Series Operation And Service Manual

Table of Contents

4.4.1 Single Mechanical Seal

This type of shaft seal is used in most applications with products that have a viscosity of less than 1,000 cPs. The maximum

rotational speed of this seal is 1500 rpm and the maximum service pressure is 13.5 bar (195 psig). The seal materials available are

stainless steel, carbon, silicone carbide, and tungsten. The standard o-rings supplied in these seals are FDA-viton or FDA-EPDM.

These can be replaced with other materials upon request.

Loosen and remove the acorn nuts from the Rotor Housing. Loosen the Threaded Studs by locking two M6 nuts against each

other on the exposed threaded stud ends. Remove the Rotor Housing by pulling on the ports or by tapping gently with a rubber

mallet. Do not rock the housing back and forth excessively. This can cause the seals to break. Remove the Stationary Seal Faces

and Stationary Seal O-Rings by pulling them out of the rotor housing. Remove the Rotating Seal Faces, the Rotating Seal O-

Rings, and Rotating Seal Washers by sliding them off the shafts. To avoid damage, carefully handle and store the loose

Stationary Seal Faces and the Rotating Seal Faces so that their lapped sealing surfaces do not get scratched.

UNIBLOC-PD 200-275 with Single Mechanical Seals

If missing, insert the Rotor Housing Pins into the rotor housing and the Shaft Pins into the shafts. Coat the shafts and rotor

housing bores with a product compatible lubricant. Place the Rotating Seal O-Rings in the Rotating Seal Face first, and then the

Rotating Seal Washers. Slide the Rotating Seal Rings, slotted side first, onto the shafts. Place the Wave Springs between the

Rotor Housing Pins. Place the Stationary Seal O-Rings in the groove of the Stationary Seal Faces. Align the slots of the

Stationary Seal Faces with the Rotor Housing Pins in the rotor housing. Push the Stationary Seal Faces into the rotor housing,

o-ring side first. Press several times to make sure they slide easily. Place a product compatible lubricant on the sealing surfaces.

Proceed to section 4.4.5 to complete the installation.

Page 16 of 4

Table of Contents