single spring water pump mechanical seal John crane type 21

We are able to often satisfy our respected customers with our great good quality, good cost and good assistance due to we’ve been far more skilled and more hard-working and do it in cost-effective way for single spring water pump mechanical seal John crane type 21, Our enterprise is functioning from the operation principle of “integrity-based, cooperation created, people oriented, win-win cooperation”. We hope we can have a pleasant romance with businessman from all around the entire world.
We are able to often satisfy our respected customers with our great good quality, good cost and good assistance due to we’ve been far more skilled and more hard-working and do it in cost-effective way for Mechanical Pump Seal, Type 21 Mechanical Seal, Water Pump Shaft Seal, Custom orders are acceptable with different quality grade and customer’s especial design. We’ve been looking forward to establish the good and successful cooperation in business with long terms from the customers of all over the world.

Features

• The drive band’s “dent and groove” design eliminates overstressing of the elastomer bellows to prevent bellows slip and protect the shaft and sleeve from wear
• Non-clogging, single-coil spring provides greater dependability than multiple spring designs and will not foul due to fluid contact
• Flexible elastomer bellows automatically compensates for abnormal shaft-end play, run-out, primary ring wear and equipment tolerances
• Self-aligning unit automatically adjusts for shaft end play and run-out
• Eliminates potential shaft fretting damage between the seal and shaft
• Positive mechanical drive protects the elastomer bellows from overstressing
• Single coil spring improves tolerance to clogging
• Simple to fit and field repairable
• Can be used with practically any type of mating ring

Operation Ranges

• Temperature: -40˚F to 400°F/-40˚C to 205°C (depending on materials used)
• Pressure: up to 150 psi(g)/11 bar(g)
• Speed: up to 2500 fpm/13 m/ s (depending on configuration and shaft size)
• This versatile seal can be used on a wide range of equipment including centrifugal, rotary and turbine pumps, compressors, mixers, blenders, chillers, agitators, and other rotary shaft equipment
• Ideal for pulp and paper, pool and spa, water, food processing, wastewater treatment, and other general applications

Recommended Application

• Centrifugal Pumps
• Slurry Pumps
• Submersible Pumps
• Mixers & Agitators
• Compressors
• Autoclaves
• Pulpers

Combination Material

Rotary Face 
Carbon graphite resin impregnated
Silicon carbide (RBSIC)
Hot-Pressing Carbon C
Stationary Seat 
Aluminium oxide (Ceramic)
Silicon carbide (RBSIC)
Tungsten carbide

Auxiliary Seal
Nitrile-Butadiene-Rubber (NBR)
Fluorocarbon-Rubber (Viton)
Ethylene-Propylene-Diene (EPDM)
Spring
Stainless Steel (SUS304, SUS316)
Metal Parts
Stainless Steel (SUS304, SUS316)

Type W21 DIMENSION DATA SHEET (INCHES)

single spring mechanical seal, water pump shaft seal, mechanical pump seal