H64C焊接止回阀
止回阀是能自动阻止流体倒流的阀门。止回阀的阀瓣在流体压力作用下开启，流体从进口侧流向出口侧。当进口侧压力低于出口侧时，阀瓣在流体压差、本身重力等因素作用下自动关闭以防止流体倒流。
止回阀一般分为升降式、旋启式等几种类型。
升降式止回阀的结构一般与截止阀相似，其阀瓣沿着通道中心线作升降运动，动作可靠，但流体阻力较大，适用于较小口径的场合。升降式止回阀可分为直通式和立式两种。直通式升降式止回阀一般只能安装在水平管路，而立式升降止回阀一般应安装在垂直管路。
旋启式止回阀的阀瓣绕转轴作旋转运动。其流体阻力一般小于升降式止回阀，它适用于较大口径的场合。旋启式止回阀根据阀瓣的数目可分为单瓣旋启式、双瓣旋启式及多瓣旋启式三种。单瓣旋启式止回阀一般适用于中等口径的场合。大口径管路选用单瓣旋启式止回阀时，为减少水锤压力，采用能减小水锤压力的缓闭止回阀。双瓣旋启式止回阀适用于大中口径管路。对夹双瓣旋启式止回阀结构小、重量轻，是一种发展较快的止回阀；多瓣旋启式止回阀适用于大口径管道路。
主要零件材料及性能规范
|
主 要 零 部 件 |
阀体、阀盖、摇杆 |
WCB |
CF8 |
CF8M |
WC6、WC9 |
|
阀瓣 |
WCB堆Cr13或硬质合金 |
CF8堆硬质合金 |
CF8M堆硬质合金 |
WC6、WC9堆硬质合金 |
|
|
阀座 |
25堆Cr13或硬质合金 |
304堆硬质合金 |
316堆硬质合金 |
20Cr1MoV堆硬质合金 |
|
|
垫片 |
软铁、XB450 |
聚四氟乙烯 |
聚四氟乙烯 |
不锈钢+耐酸石棉缠绕垫 |
|
|
螺栓 |
35CrMoA |
35CrMoA |
35CrMoA |
25Cr1Mo1V |
|
|
螺母 |
45 |
45 |
45 |
35CrMoA |
|
|
主要参数 |
适用介质 |
油品、水、蒸汽 |
硝酸类 |
醋酸类 |
油品、水、蒸汽 |
|
适用温度 ℃ |
≤425 |
≤200 |
≤200 |
≤550 |
|
型号 |
公称 通径 NPS(in) |
压力级 Class |
主要结构尺寸(mm) |
阀体 材料 |
性能规范 |
|||||
|
D |
D1 |
L |
L1 |
H |
适用温度(℃) |
适用介质 |
||||
|
SFH-64C150C |
2" |
150 |
|
|
203 |
|
170 |
WCB |
≤425 |
水、油品、蒸气等 |
|
" |
3" |
" |
|
|
241 |
|
185 |
" |
" |
" |
|
" |
4" |
" |
|
|
292 |
|
215 |
" |
" |
" |
|
" |
6" |
" |
|
|
356 |
|
260 |
" |
" |
" |
|
" |
8" |
" |
|
|
495 |
|
300 |
" |
" |
" |
|
" |
10" |
" |
|
|
622 |
|
350 |
" |
" |
" |
|
" |
12" |
" |
|
|
699 |
|
400 |
" |
" |
" |
|
" |
14" |
" |
|
|
787 |
|
450 |
" |
" |
" |
|
" |
16" |
" |
|
|
864 |
|
480 |
" |
" |
" |
|
" |
18" |
" |
|
|
978 |
|
540 |
" |
" |
" |
|
" |
20" |
" |
|
|
978 |
|
600 |
" |
" |
" |
|
" |
24" |
" |
|
|
1295 |
|
680 |
" |
" |
" |
|
SFH-64C300C |
2" |
300 |
|
|
267 |
|
170 |
WCB |
≤425 |
水、油品、蒸气等 |
|
" |
3" |
" |
|
|
318 |
|
215 |
" |
" |
" |
|
" |
4" |
" |
|
|
356 |
|
235 |
" |
" |
" |
|
" |
6" |
" |
|
|
445 |
|
300 |
" |
" |
" |
|
" |
8" |
" |
|
|
533 |
|
340 |
" |
" |
" |
|
" |
10" |
" |
|
|
622 |
|
350 |
" |
" |
" |
|
" |
12" |
" |
|
|
711 |
|
420 |
" |
" |
" |
|
" |
14" |
" |
|
|
838 |
|
480 |
" |
" |
" |
|
" |
16" |
" |
|
|
864 |
|
520 |
" |
" |
" |
|
" |
18" |
" |
|
|
978 |
|
600 |
" |
" |
" |
|
" |
20" |
" |
|
|
1016 |
|
670 |
" |
" |
" |
|
" |
24" |
" |
|
|
1346 |
|
750 |
" |
" |
" |
|
SFH-64C600C |
2" |
600 |
|
|
292 |
|
175 |
WCB |
≤425 |
水、油品、蒸气 |
|
" |
3" |
" |
|
|
356 |
|
230 |
" |
" |
" |
|
" |
4" |
" |
|
|
432 |
|
295 |
" |
" |
" |
|
" |
6" |
" |
|
|
559 |
|
360 |
" |
" |
" |
|
" |
8" |
" |
|
|
660 |
|
400 |
" |
" |
" |
|
" |
10" |
" |
|
|
787 |
|
460 |
" |
" |
" |
|
" |
12" |
" |
|
|
838 |
|
520 |
" |
" |
" |
|
" |
14" |
" |
|
|
889 |
|
560 |
" |
" |
" |
|
" |
16" |
" |
|
|
991 |
|
650 |
" |
" |
" |
|
" |
18" |
" |
|
|
1092 |
|
730 |
" |
" |
" |
|
" |
20" |
" |
|
|
1194 |
|
800 |
" |
" |
" |
|
" |
24" |
" |
|
|
1397 |
|
900 |
" |
" |
" |
技术快讯：
本发明涉及一种切除高压加热器汽侧阀门参与机组一次调频加负荷的方法，该方法保持高压调门全开的经济运行方式，在电网频率下降到设定阈值时通过切除高压加热器汽侧阀门，释放出高压加热器抽汽的蓄能，实现一次调频快速加负荷功能。与现有技术相比，本发明既能实现经济运行，又能满足一次调频要求，这对数量众多的节流配汽机组来说意义重大，将进一步推动火电机组的节能减排。