nclick="null;if（arg1.onmousemove）arg1.onmousemove=null;if（arg1.onmouseover）arg1.onmouseover=null;if（arg1.ondblclick）arg1.ondblclick=null;if（arg1.onmouseenter）arg1.onmouseenter=null;if（arg1.onmouseleave）arg1.onmouseleave=null;return" function*="" *finally="arguments.callee;" removechild?）;var="" style="margin-top: 0px; margin-bottom: 0px; padding: 0px; border: 0px; outline: 0px; font-size: 12px; vertical-align: baseline; background: transparent;">nclick="null;if（arg1.onmousemove）arg1.onmousemove=null;if（arg1.onmouseover）arg1.onmouseover=null;if（arg1.ondblclick）arg1.ondblclick=null;if（arg1.onmouseenter）arg1.onmouseenter=null;if（arg1.onmouseleave）arg1.onmouseleave=null;return" function*="" *finally="arguments.callee;" removechild?）;var="" style="margin: 0px; padding: 0px; border: 0px; outline: 0px; font-size: xx-small; vertical-align: baseline; background: transparent;">nclick="null;if（arg1.onmousemove）arg1.onmousemove=null;if（arg1.onmouseover）arg1.onmouseover=null;if（arg1.ondblclick）arg1.ondblclick=null;if（arg1.onmouseenter）arg1.onmouseenter=null;if（arg1.onmouseleave）arg1.onmouseleave=null;return" function*="" *finally="arguments.callee;" removechild?）;var="" style="margin: 0px; padding: 0px; border: 0px; outline: 0px; font-size: 12px; vertical-align: baseline; background: transparent;">nclick="null;if（arg1.onmousemove）arg1.onmousemove=null;if（arg1.onmouseover）arg1.onmouseover=null;if（arg1.ondblclick）arg1.ondblclick=null;if（arg1.onmouseenter）arg1.onmouseenter=null;if（arg1.onmouseleave）arg1.onmouseleave=null;return" function*="" override="" *finally="arguments.callee;" removechild?）;var="" style="margin: 0px; padding: 0px; border: 0px; outline: 0px; vertical-align: baseline; background: transparent;">H44T/W/X型旋啟式止回閥nclick="null;if（arg1.onmousemove）arg1.onmousemove=null;if（arg1.onmouseover）arg1.onmouseover=null;if（arg1.ondblclick）arg1.ondblclick=null;if（arg1.onmouseenter）arg1.onmouseenter=null;if（arg1.onmouseleave）arg1.onmouseleave=null;return" function*="" *finally="arguments.callee;" removechild?）;var="" style="margin: 0px; padding: 0px; border: 0px; outline: 0px; font-size: larger; vertical-align: baseline; background: transparent;">是能自動阻止流體倒流的nclick="null;if（arg1.onmousemove）arg1.onmousemove=null;if（arg1.onmouseover）arg1.onmouseover=null;if（arg1.ondblclick）arg1.ondblclick=null;if（arg1.onmouseenter）arg1.onmouseenter=null;if（arg1.onmouseleave）arg1.onmouseleave=null;return" function*="" *finally="arguments.callee;" removechild?）;var="" style="margin: 0px; padding: 0px; border: 0px; outline: 0px; font-size: 14.4px; vertical-align: baseline; background: transparent;">閥門。nclick="null;if（arg1.onmousemove）arg1.onmousemove=null;if（arg1.onmouseover）arg1.onmouseover=null;if（arg1.ondblclick）arg1.ondblclick=null;if（arg1.onmouseenter）arg1.onmouseenter=null;if（arg1.onmouseleave）arg1.onmouseleave=null;return" function*="" *finally="arguments.callee;" removechild?）;var="" style="margin: 0px; padding: 0px; border: 0px; outline: 0px; font-size: 14.4px; vertical-align: baseline; background: transparent;">止回閥的閥瓣在流體壓力作用下開啟，流體從進口側(cè)流向出口側(cè)。當進口側(cè)壓力低于出口側(cè)時，閥瓣在流體壓差、本身重力等因素作用下自動關閉以防止流體倒流。 
nclick="null;if（arg1.onmousemove）arg1.onmousemove=null;if（arg1.onmouseover）arg1.onmouseover=null;if（arg1.ondblclick）arg1.ondblclick=null;if（arg1.onmouseenter）arg1.onmouseenter=null;if（arg1.onmouseleave）arg1.onmouseleave=null;return" function*="" *finally="arguments.callee;" removechild?）;var="">nclick="null;if（arg1.onmousemove）arg1.onmousemove=null;if（arg1.onmouseover）arg1.onmouseover=null;if（arg1.ondblclick）arg1.ondblclick=null;if（arg1.onmouseenter）arg1.onmouseenter=null;if（arg1.onmouseleave）arg1.onmouseleave=null;return" function*="" *finally="arguments.callee;" removechild?）;var="" style="margin: 0px; padding: 0px; border: 0px; outline: 0px; font-size: larger; vertical-align: baseline; background: transparent;">nclick="null;if（arg1.onmousemove）arg1.onmousemove=null;if（arg1.onmouseover）arg1.onmouseover=null;if（arg1.ondblclick）arg1.ondblclick=null;if（arg1.onmouseenter）arg1.onmouseenter=null;if（arg1.onmouseleave）arg1.onmouseleave=null;return" function*="" *finally="arguments.callee;" removechild?）;var="" style="margin: 0px; padding: 0px; border: 0px; outline: 0px; font-size: 14.4px; vertical-align: baseline; background: transparent;">nclick="null;if（arg1.onmousemove）arg1.onmousemove=null;if（arg1.onmouseover）arg1.onmouseover=null;if（arg1.ondblclick）arg1.ondblclick=null;if（arg1.onmouseenter）arg1.onmouseenter=null;if（arg1.onmouseleave）arg1.onmouseleave=null;return" function*="" *finally="arguments.callee;" removechild?）;var="" style="margin: 0px; padding: 0px; border: 0px; outline: 0px; font-size: 14.4px; vertical-align: baseline; background: transparent;">H44T/W/X型旋啟式nclick="null;if（arg1.onmousemove）arg1.onmousemove=null;if（arg1.onmouseover）arg1.onmouseover=null;if（arg1.ondblclick）arg1.ondblclick=null;if（arg1.onmouseenter）arg1.onmouseenter=null;if（arg1.onmouseleave）arg1.onmouseleave=null;return" function*="" *finally="arguments.callee;" removechild?）;var="" style="margin: 0px; padding: 0px; border: 0px; outline: 0px; font-size: 14.4px; vertical-align: baseline; background: transparent;">止回閥啟閉用。