METERING VALVE

摘要

METERING VALVE A metering valve having a one-piece bonnet for reducing problems resulting from tolerance stack up. A guide portion is included on the nose of the bonnet for cooperation with a valve body bore to ensure concentric alignment between the metering pin and its associated orifice. A pair of O-rings on the valve stem cooperate with the bonnet bore to absorb forces and substantially reduce the potential for galling and breakage of the metering pin. One of the O-rings is compressed to a substantially greater extent than the other to aid in achieving better alignment between the stem and bonnet, and to obtain a firmer feel. A handle is included at the outer end of the valve stem and receives an upper portion of the valve bonnet. A packing is interposed between the handle and valve bonnet upper portion for limiting lateral movement between the handle and valve stem. The packing may be selectively adjusted without altering a preset deadstop position of the valve.