<?xml version="1.0" encoding="utf-8"?><!DOCTYPE Zthes SYSTEM "http://zthes.z3950.org/xml/zthes-05.dtd">  <Zthes><term><termId>31413780</termId><termName>ball valves</termName><termType>PT</termType><termNote><![CDATA[ Spherically shaped gate valves which provide a very tight shut-off for fluids in a high-pressure piping system. ]]></termNote><termCreatedDate>2026-03-30 20:51:17</termCreatedDate><relation><relationType>UF</relationType><termId>31413781</termId><termName>ball valve</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31413782</termId><termName>valves, ball</termName><termType>ND</termType></relation><relation><relationType>BT</relationType><termId>31377749</termId><termName>valves</termName><termType>PT</termType></relation></term>  </Zthes>