Founded in 1996, China Xiqiang Pumps Co., Ltd. is professional mechanical seal manufacturer and wholesaler for the household, industrial and agricultural industries. With 80% components home made, quality is better controlled here. GS, CE, UL, EMC & EMF certificates guarantee received products to be high quality for customers. We have become the long-term custom mechanical seals supplier of world-class retailers such as B&Q, BAUHAUS, OBI, METRO, etc.

John Crane is the acknowledged leader and world's largest designer, manufacturer, and supplier of engineered sealing systems, solutions, and associated products. We provide the most complete selection of engineered mechanical seals, mechanical packing, and sealing support systems, complemented by power transmission couplings and centralised lubrication systems.
Focused on quality customer care, John Crane delivers superior products and services to a variety of industries in a manner that allows customers to focus on their core business, knowing that their sealing system needs are in good hands.
The "working length" of the seal is critical to your seal application. To identify the working length, measure your mechanical seal end to end as it is pictured above, this is your seals "total length". From this you must subtract 50% of the uncompressed spring length. This is your mechanical seals working length.
To make sure your pump seals stationay seat fits, it's a good idea to provide the inside dimension of the bore it will be fitting into. The outside dimension of your seals stationary seat is helpful but more difficult to obtain an acurrate measurement. Most pump seal stationary seats have a rubber cup or o-ring that must be compressed when it is installed.

Operating Conditions
Pressure: Up to 10bar or 145psi
Speed: Up to 10m/s or 33ft/s
Temperature: -40C to 200C or -40F to 390F
(depending on materials used)
In some cases, we are not able to directly cross reference a seal in our cross reference to pump manufacturers. In order to assure you receive the correct seal for your pump, it is very important that you supply us with accurate information. Below, you will see a sequence of photos which will help us identify the seal assembly you have.
The major rotating components are the "seal head" and the "spring", remove the "seal head from the "spring".
On the back side of the seal head (the end which fits towards the spring), measure the inside diameter. This will determine the seal size diameter - which is either the shaft size or the sleeve size that the seal fits over. The front side of the seal usually has a black carbon face. The carbon face runs against the "stationary" portion or "seat" of the seal assembly.
Now, measure the "spring" length while it is separated from the "seal head".
Once you have determined, the sizing - then we need to know the materials the seal is made from.
Unless you are pumping chemicals or high temperature liquids, then it is most like Nitrile; also called NBR or Buna-N. The "stationary" or "seat" is either an o-ring mount or a cup mount type.

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