德國寶碩,BUSCHJOST單向閥結構圖

彈簧式:液體(ti)由(you)下而上，依靠壓力(li)(li)頂起彈簧控(kong)制的閥瓣(ban)，壓力(li)(li)消(xiao)失后，彈簧力(li)(li)將閥瓣(ban)壓下，封閉液體(ti)倒流。常(chang)用(yong)于通(tong)徑較小(xiao)的止回閥。

重(zhong)力式(shi):和(he)彈(dan)簧式(shi)相似，依靠閥瓣的自身(shen)重(zhong)力封閉(bi)，防止倒流。

旋啟式:液(ye)體在閥(fa)體內直通(tong)，依(yi)靠壓力(li)頂(ding)開一側(ce)的(de)旋轉(zhuan)閥(fa)瓣(ban)(ban)(ban)，壓力(li)失(shi)去后，閥(fa)瓣(ban)(ban)(ban)依(yi)靠自重回(hui)位，反向的(de)液(ye)體壓力(li)封閉閥(fa)瓣(ban)(ban)(ban)。

塑料隔(ge)膜(mo)式: 外(wai)殼(ke)(ke)和隔(ge)膜(mo)均為(wei)塑料.一般外(wai)殼(ke)(ke)為(wei)ABS,PE,PP,NYLON, PC.隔(ge)膜(mo)有硅樹脂,氟樹脂等。

其它(ta)的單向閥(fa)(止(zhi)回(hui)(hui)閥(fa))，如排(pai)污的止(zhi)回(hui)(hui)閥(fa)，人防(fang)的防(fang)爆閥(fa)和液體使用的止(zhi)回(hui)(hui)閥(fa)的原理是大同小異。

旋啟式止回閥適(shi)(shi)用(yong)(yong)介質(zhi)(zhi):水，蒸氣，油品(pin)，硝酸(suan)(suan)，強氧化介質(zhi)(zhi)和尿素等。廣泛應用(yong)(yong)于(yu)電站，石油，化工，制藥，食(shi)品(pin)等行業。可(ke)與進口設備直接配套使用(yong)(yong)。對夾式止回閥適(shi)(shi)用(yong)(yong)于(yu)公(gong)稱壓力PN1.0MPa~42.0MPa、Class150~2500;公(gong)稱通徑DN12~1200mm、NPS1/2~48;工作溫度-196~540℃的各種管路(lu)上(shang)，用(yong)(yong)于(yu)防(fang)止介質(zhi)(zhi)倒流。通過選用(yong)(yong)不同的材質(zhi)(zhi)，可(ke)適(shi)(shi)用(yong)(yong)于(yu)水、蒸汽、油品(pin)、硝酸(suan)(suan)、醋酸(suan)(suan)、強氧化性介質(zhi)(zhi)及尿素等多(duo)種介質(zhi)(zhi)。

寶碩單向閥實物(wu)圖;

德國寶碩,BUSCHJOST單向閥結構圖
engineers practice wellknown in the member countries.
The CE-sign at the valve refers not to the PED. Thus the declaration of
conformity is not longer applicable for this directive.
For valves > DN 25 (G 1) Art. 3 § (1) .4 applies.
The basic requirements of the Enclosure I of the PED must be fulfilled.
The CE-sign at the valve includes the PED. A certificate of conformity of
this directive will be available on request.
The valves of this series, including the connection size DN 25
(G 1), are according to Art. 3 § 3 of the Pressure Equipment Directive (PED)
97/23/EG. This means interpretation and production are in accordance to