產(chǎn)品關(guān)鍵詞：
止回閥,焊接止回閥,,,,
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止回閥是能自動(dòng)阻止流體倒流的閥門。止回閥的閥瓣在流體壓力作用下開啟，流體從進(jìn)口側(cè)流向出口側(cè)。當(dāng)進(jìn)口側(cè)壓力低于出口側(cè)時(shí)，閥瓣在流體壓差、本身重力等因素作用下自動(dòng)關(guān)閉以防止流體倒流。
止回閥一般分為升降式、旋啟式等幾種類型。
升降式止回閥的結(jié)構(gòu)一般與截止閥相似，其閥瓣沿著通道中心線作升降運(yùn)動(dòng)，動(dòng)作可靠，但流體阻力較大，適用于較小口徑的場(chǎng)合。升降式止回閥可分為直通式和立式兩種。直通式升降式止回閥一般只能安裝在水平管路，而立式升降止回閥一般應(yīng)安裝在垂直管路。
旋啟式止回閥的閥瓣繞轉(zhuǎn)軸作旋轉(zhuǎn)運(yùn)動(dòng)。其流體阻力一般小于升降式止回閥，它適用于較大口徑的場(chǎng)合。旋啟式止回閥根據(jù)閥瓣的數(shù)目可分為單瓣旋啟式、雙瓣旋啟式及多瓣旋啟式三種。單瓣旋啟式止回閥一般適用于中等口徑的場(chǎng)合。大口徑管路選用單瓣旋啟式止回閥時(shí)，為減少水錘壓力，最好采用能減小水錘壓力的緩閉止回閥。雙瓣旋啟式止回閥適用于大中口徑管路。對(duì)夾雙瓣旋啟式止回閥結(jié)構(gòu)小、重量輕，是一種發(fā)展較快的止回閥；多瓣旋啟式止回閥適用于大口徑管道路。
主要零件材料及性能規(guī)范
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主 要 零 部 件
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閥體、閥蓋、搖桿
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WCB
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CF8
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CF8M
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WC6、WC9
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閥瓣
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WCB堆Cr13或硬質(zhì)合金
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CF8堆硬質(zhì)合金
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CF8M堆硬質(zhì)合金
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WC6、WC9堆硬質(zhì)合金
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閥座
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25堆Cr13或硬質(zhì)合金
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304堆硬質(zhì)合金
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316堆硬質(zhì)合金
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20Cr1MoV堆硬質(zhì)合金
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墊片
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軟鐵、XB450
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聚四氟乙烯
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聚四氟乙烯
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不銹鋼+耐酸石棉纏繞墊
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螺栓
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35CrMoA
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35CrMoA
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35CrMoA
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25Cr1Mo1V
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螺母
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45
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45
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45
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35CrMoA
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主要參數(shù)
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適用介質(zhì)
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油品、水、蒸汽
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硝酸類
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醋酸類
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油品、水、蒸汽
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適用溫度
℃
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≤425
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≤200
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≤200
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≤550
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型號(hào)
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公稱
通徑
NPS(in)
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壓力級(jí)
Class
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主要結(jié)構(gòu)尺寸(mm)
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閥體
材料
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性能規(guī)范
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D
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D1
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L
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L1
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H
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適用溫度(℃)
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適用介質(zhì)
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SFH-64C150C
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2"
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150
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203
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170
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WCB
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≤425
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水、油品、蒸氣等
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"
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3"
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"
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241
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185
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"
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"
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"
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"
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4"
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"
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292
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215
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"
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"
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"
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"
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6"
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"
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356
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260
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"
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"
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"
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"
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8"
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"
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495
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300
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"
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"
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"
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"
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10"
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"
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622
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350
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"
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"
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"
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"
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12"
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"
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699
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400
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"
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"
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"
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"
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14"
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"
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787
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450
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"
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"
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"
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"
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16"
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"
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864
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480
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"
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"
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"
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"
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18"
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"
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978
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540
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"
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"
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"
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"
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20"
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"
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978
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600
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"
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"
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"
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"
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24"
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"
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1295
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680
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"
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"
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"
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SFH-64C300C
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2"
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300
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267
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170
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WCB
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≤425
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水、油品、蒸氣等
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"
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3"
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"
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318
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215
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"
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"
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"
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"
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4"
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"
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356
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235
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"
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"
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"
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6"
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"
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445
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300
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"
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"
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"
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8"
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"
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533
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340
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"
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"
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"
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10"
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"
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622
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350
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"
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"
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"
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"
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12"
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"
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711
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420
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"
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"
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"
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"
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14"
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"
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838
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480
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"
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"
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"
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16"
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"
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864
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520
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"
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"
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"
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18"
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"
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978
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600
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"
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"
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"
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"
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20"
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"
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1016
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670
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"
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"
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"
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"
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24"
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"
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1346
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750
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"
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"
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"
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SFH-64C600C
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2"
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600
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292
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175
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WCB
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≤425
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水、油品、蒸氣
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"
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3"
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"
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|
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356
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230
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"
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"
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產(chǎn)品關(guān)鍵詞：
止回閥,焊接止回閥,,,,
![焊接止回閥H64C焊接止回閥]()
