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KNIFE GATE VALVES -- MODEL A

DOC. A.12/07 Resilient Seat Materials EPDM This is the standard resilient seat installed on CMO valves. It can be used in many applications, but generally it is used for water and products diluited in water at temperatures not higher than 90ºC.The EPDM rubber can also be used for abrasive products. It provides 100% tightness. NITRILE It is used for greasy fluids or oils at temperatures not higher than 90 ºC. It provides 100% tightness. VITON Appropriate for corrosive products and high temperatures up to 190ºC in continuous and picks of 210ºC. It provides 100% tightness. SYLICONE The silicone is used mainly into the food industry and pharmaceutical products with temperatures not higher than 200ºC. It provides 100% tightness. Note : In some applications other different resilient materials are used as, for example, hypalon, butile and natural rubber. Please contact with us in case of such request. PTFE It is used for corrosive products and PH from 2 to 12. This sealing material does not proved 100% tightness. The estimated leakage is 0.5% of the total flow.

4) PACKING

As standard the packing is composed by three lines with an EPDM o-ring in the middle. It provides the tightness between the body and the gate and avoids any kind of leakage to the atmosphere. The packing is located in an easily accessible place and can be changed without dismantling the valve from the pipeline.Several types of packing can be supplied according to the different applications in which the valve can be located as follows: GREASED COTTON (Recommended for hydraulic services) This packing is made with cotton threads and has impregnated both the inside and the outside with tallow. It is manufactured by the solid system. It is a packing for general use in hydraulic services for pumps as well as for valves. P(bar) = 10 / T = 100ºC PH = 6-8 DRY COTTON This packing is made with cotton threads. It is manufactured by the solid system. This is a packing only for solid products. P(bar) = 0.5 / T = 100ºC PH = 6-8 COTTON + P.T.F.E. This packing is made with cotton threads and has the inside and outside impregnated with P.T.F.E. It is manufactured by the solid system. It is a packing for general use in hydraulic services for pumps as well as for valves. P(bar) = 30 / T = 120ºC PH = 6-8 C.M.O. Amategui Aldea 142, 20400 Txarama-Tolosa (SPAIN) Phone: 943-67.33.99 / Fax:943.67.24.40 / cmo@cmo.es http://www.cmo.es -4-