| What does the K in the pump model number mean? |
| Some Block-Style Pumps have a special K version. On these K version pumps, the inlet manifold is specially ported to allow a fresh water or compatible liquid flush to circulate behind the
seals. This is used when pumping high temperature liquids or when there is a concern for escaping of hazaradous emmisions. These pumps also permit higher inlet pressures for pumping liquid gases such as CO2. Inquire with technical sales for further assistance for these special applications. |
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| What does the S stamped in the manifold mean? |
| The - S - stamped in the manifold face indicates the pump contains stainless steel inserts in both the seal and valve chambers. These inserts offer extended life especially in hard water applications. The 310S, 340S and 350S will feature the Lifetime Warranty like the 5CP2120W, 5CP2140W and 5CP2150W models. If your 310S is serviced, the new manifold will be stamped with an - R - indicating it is a replacement as the Lifetime Warranty applies to the original manifold only. |
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| What does the W stamped in the manifold mean? |
| The models 310W, 340W and 350W, 5 Frame pumps, are stamped with a -W- in the face of the manifold. This identifies the pump manifold was built with the special W770 alloy. Although the -W- manifold was used for both the 5CP and 5 Frame pumps, the Lifetime Warranty applied only to the 5CP models. The -W- was not part of the original design feature of the 310, 340 and 350 pumps. The-W-manifold has now been replaced with the -S- sleeved-manifold which also carries a lifetime warranty. Whenever a manifold is replace during servicing, it will be stamped with an -R- indicating it is not the original manifold. Replacement manifolds do not carry the Lifetime Warranty. |
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| What is wash out? |
| Washout is erosion within the pump head, generally around sealing surfaces. The valve chamber surface that comes in contact with the valve seat o-ring is a typical place for erosion to begin. The contact point of the Hi-Pressure Seals is another location for erosion to begin. This erosion can occur on the manifold interior, the V-Packing Spacer or V-Packing Cylinder, depending upon the pump style.
Pumps with erosion will begin losing pressure or show external water leaks. If the pump continues to operat with leaking seals, the erosion conditions will not be improved with a seal and o-ring change as the contact surfaces within the pump have eroded enough to cause poor sealing with the new seals and o-rings.
Erosion can occur as a result of the liquid not being compatible with the liquid-end construction. Hard water, high pH liquids, sea water, acids or other harsh liquids can cause erosion. Continued operation with excessively worn seals and o-rings will also result in erosion. It is important to review your maintenance schedule and initiate a more frequent service cycle, so seals and o-rings are replaced before the pump begins leaking. When pumping difficult liquids, erosion can be minimized with a fresh water flush prior to dormant cycles. Flushing will help eliminate contaminants sitting in the pump for prolonged periods which will minimize attack and prolong the life of the pump. It is also important to review the Chemical Compatibility chart to determine if a 316 SS or Duplex SS upgrade is needed.
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