Allergies ***ociated with winter and Christmas

[travels]

http://www.helium.com/items/100743-allergies-***ociated-with-winter-and-christmas

Winter and Christmas allergies are equally or worse than other seasonal allergies. During winter season, air circulation in homes, limited by doors and windows closed, prevent cold air from entering. In uncirculated air, allergens built up or breed, especially in energy efficient homes, and homes being renovated

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[haoyun999z]

A V port chemical ball valve (http://www.corrosion-resistant-valves.com/ptfe-lined-pipe.html) has either a 'v' shaped ball or a 'v' shaped seat. This allows the orifice to be opened and closed in a more controlled manner with a closer to linear flow characteristic. When the valve is in the closed position and opening is commenced the small end of the 'v' is opened first allowing stable flow control during this stage. This type of design requires a generally more robust construction due to higher velocities of the fluids, which would quickly damage a standard valve.