KNIFE GATE VALVES -- MODEL A
DOC. A.12/07
ADVANTAGES OF CMO “MODEL A” COMPARING WITH SIMILAR PRODUCTS
When a knife gate
valve stays open for a long time and its inside body walls are parallel a big torque is needed to close it. The model A has conically shaped inside body walls that provide a bigger space. So, when closing the knife the product stocked in the inside of the body is cleared easily. This
valve is defined as unidirectional and on unidirectional knife gate
valves when there is a back pressure the knife can bend. This is something that can not happen with the CMO
valve because it has a guiding supports system that allows to the
valve to work with a back pressure of 30% of the maximum rated working pressure without any deformation of the knife. The stem protection hood is independent from the hand wheel fixing system, so the hood can be removed without removing the hand wheel. This point allows normal maintenance operations like greasing of the spindle, etc. The spindle (stem) of the CMO
valve is made of stainless steel 18/8. This point is very important because there are manufacturers that manufacture it with 13% CR and it gets rusty in a very short time. The hand wheel of the manual actuator is made of nodular iron GGG-50. Some manufacturers manufacture it on normal cast iron and they can break easily when receiving any big torque or knock. The bridge of the CMO manual actuator is manufactured in a compact way, with the bronze nut protected in a greased and closed box. This point gives the possibility to move it with a key even without the hand wheel (in other manufacturer
valves this is not possible). The pneumatic actuator upper and lower caps are made of nodular iron GGG-50, therefore their resistance to the knocks is very high. This characteristic is essential in this type of pneumatic cylinder. Special care must be taken with cylinders with covers in aluminium or cast iron The sealing o-rings of the pneumatic cylinders are commercial and they can be bought all over the world, it is not needed, therefore, to contact CMO every time that these spares are needed.
STANDARD MANUFACTURING MATERIALS (OPTIONS 1 AND 2)
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 -2-
