| 摘要 |
PURPOSE: A constant feed valve is provided to easily replace sealing parts, conveniently control the discharge by controlling the discharge while seeing with the naked eye, prevent abnormal operation of peripheral apparatus, and easily check the period for replacement of the valve or the parts through an inspection glass. CONSTITUTION: A constant feed valve comprises a valve body(2) having a fluid supply passage(21) for supplying fluid to the upper part of a piston(52) of a volumetric chamber(52') and a fluid discharge passage(21') for discharging fluid by descent of the piston; a valve cover(3) fixed to the lower part of the valve body by a wrench bolt; an air cylinder body(4) assembled on the valve body; a volumetric chamber tube(5) assembled on the air cylinder body; and a head cover(6) mounted to the upper end of the volumetric chamber tube. The valve body has a fluid supply part(2A) comprising spool packings and a washer around a fluid supply ring having a fluid supply hole, and forms a fluid admission port(25) communicating with the fluid supply hole. A discharge hole communicating with the fluid discharge passage is formed to the lower part of the spool packing. The upper part of a packing housing(26) with a spool packing and a washer is inserted into the lower inside of the discharge hole. The valve cover has a fluid discharge port(33) with a space ring(32) to the middle lower part, and a spool guide bush(34) with discharge-uneven grooves and the washer and the lower part of the packing housing are inserted into the upper part of the valve cover. A packing is installed between the valve body and the valve cover. The air cylinder body has a fluid supply passage(41) and a fluid discharge passage(41') on a side and has an operating space of the piston in the middle. Air ports(44,44') are disposed to the other upper and lower parts of the operating space. A spool(42) forming an fluid supply-uneven part(42a) is fixed to the middle part of the piston. The volumetric chamber tube has a fluid supply passage(51) and a fluid discharge passage(51').
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