2015年12月2日星期三
Range hood check valve
The "check valve", also called "butterfly-valve", function is to allow air to one-way flow. Check valve is located in smoke lampblack machine turbofan (motor), before entering the exhaust duct, is wary of outdoor blowing winds, due to the instantaneous pressure difference between inside and outside, let outdoor air be "sucked" into the room. In theory, however, is "check valve", in a common case, it can only be "reduced valve" and not "check". Now a lot of people who live in multi-storey apartment buildings all complaints in their interior smell of other dishes.Reason is that at the bottom of the kitchen lampblack machine to lampblack to the vertical exhaust hole, because most of the building design and useless to the shaft caused "negative pressure", so the soot in the shaft up downstairs "squeeze", on the way will leak into other floors lampblack machine exhaust pipe.Because of the check valve can't be 100% sealing, the smoke nature can seep into the house.
2015年10月14日星期三
Introduction of check valve
Check valve is used to prevent the reverse flow of oil flow in hydraulic system, or used in pneumatic system to prevent reverse flow of compressed air, flowing fluid is only in the inlet and outlet medium cannot backflow.
Check valve has a straight-through and right Angle type two kinds. Straight-through one-way valve with screw thread connection installed in the pipeline.Right Angle type check valve has a threaded connection, flange connection plate connection and three forms.Hydraulic control one-way valve, also known as block valve or pressure valve, it is the same as the one-way valve, in order to prevent the oil flow.But need to reverse flow of oil flow in hydraulic circuit and available control oil pressure, open the valve, make the oil flow can flow in two direction.Hydraulic control one-way valve used cone valve core, so the sealing performance is good.In requirements when closed oil circuit, this valve is used as oil ChanXiangSuo tight and the holding role.Hydraulic control one-way valve control oil leak means has internal drainage and leaked type two kinds.In the oil flow reverse export without back pressure oil available internal drainage;Otherwise must be leaked type, in order to reduce the oil pressure control.
Check valve has a straight-through and right Angle type two kinds. Straight-through one-way valve with screw thread connection installed in the pipeline.Right Angle type check valve has a threaded connection, flange connection plate connection and three forms.Hydraulic control one-way valve, also known as block valve or pressure valve, it is the same as the one-way valve, in order to prevent the oil flow.But need to reverse flow of oil flow in hydraulic circuit and available control oil pressure, open the valve, make the oil flow can flow in two direction.Hydraulic control one-way valve used cone valve core, so the sealing performance is good.In requirements when closed oil circuit, this valve is used as oil ChanXiangSuo tight and the holding role.Hydraulic control one-way valve control oil leak means has internal drainage and leaked type two kinds.In the oil flow reverse export without back pressure oil available internal drainage;Otherwise must be leaked type, in order to reduce the oil pressure control.
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