Cur síos ar an Táirge:
Teaghrán braidáilte microfiber
Praghas: Tá praghas an Chomhla Seiceála Swing ag athrú mar gheall ar shonraíochtaí, costas ábhair agus ráta malairte. Tabhair dom do chuid faisnéise teagmhála, tabharfaidh mé an praghas is nua cothrom le dáta duit
Conas a oibríonn comhla seiceála?
Brú Scáineadh
A Swing Check Valve requires a minimum upstream pressure (pressure differential between inlet and outlet) to open the valve and allow flow through it. This minimum upstream pressure at which the valve opening occurs is called the check valve 'cracking pressure'. The specific cracking pressure changes based on the valve design and size, so ensure that your system can generate this cracking pressure and that it is suitable for the application.
Deiridh
Má thiteann an brú in aghaidh an tsrutha faoi bhun an bhrú scoilte nó má tá brú ar ais (sreabhadh ag iarraidh bogadh ón asraon go dtí an inlet), ansin dúnfaidh an comhla. Ag brath ar dhearadh na comhla seiceála, is féidir leis an meicníocht dúnta athrú. I mbeagán focal, brúnn an brú ar ais geata, liathróid, scairt, nó diosca i gcoinne an orifice agus séalaí é. Ag brath ar an dearadh is féidir earrach nó domhantarraingthe a bheith mar chuidiú leis an bpróiseas dúnta.
Treoshuíomh Suiteála
Toisc nach n-oibríonn comhla aontreo ach i dtreo amháin, tá sé ríthábhachtach go mbeadh a fhios agat an treoshuíomh suiteála ceart. Go minic, tá saighead ar an tithíocht comhla chun an treo sreafa a chur in iúl. Seachas sin, beidh ort an comhla a scrúdú chun a chinntiú go bhfuil sé suiteáilte sa treo sreafa atá beartaithe. Má tá sé ar gcúl, ní bheidh an sreabhadh in ann bogadh tríd an gcóras agus d'fhéadfadh méadú brú a bheith ina chúis le damáiste.
Seiceáil Cineálacha Comhlaí
Ag brath ar dhearadh na comhla seiceála, oibreoidh siad beagán difriúil. Is é an comhla seiceála is coitianta ná earrach atá luchtaithe i-chomhla seiceála líne, ach pléifimid cineálacha iolracha thíos.
Earrach Luchtaithe I-Líne
In-line spring loaded Swing Check Valve are common, easy to understand, and have a simple design. Figure 1 shows an example of a spring loaded in-line check valve and Figure 2 shows the main components with arrows showing flow direction. When flow enters the input port of the valve, it has to have enough pressure (force) to overcome the cracking pressure and the spring force. Once overcome, it pushes the disc, opening the orifice and allowing flow to move through the valve. When the input pressure is no longer high enough, or there is a backpressure, then the backpressure and spring push the disc against the orifice and seal the valve shut. The spring, along with the short travel distance for the disc, allows for quick reaction time for closing. This valve design also prevents against pressure surges in the line, and therefore, also prevents a water hammer from occurring. Common types of spring loaded in-line check valves are also called 'nozzle check valves' or 'silent check valves.' They can be installed in a vertical or horizontal orientation. However, since they are in-line to the system, they have to be fully removed from the line to be inspected and/or perform maintenance.
Earrach Luchtaithe Y
Spring loaded y-check valves operate very similar to in-line spring loaded check valves. The difference, as you can see in Figure 3, is that the spring and movable disc are positioned at an angle. This creates a 'y' shape, hence the name of the valve. It works the exact same as an in-line valve, but since the moveable components are at an angle it can be inspected and serviced while it is still connected to the system. However, they are larger and take up more room within the system.
Liathróid
A ball check valve uses a free-floating or spring-loaded ball that rests on the sealing seat to close the orifice. The sealing seat is normally conically tapered in order to guide the ball into the seat and create a positive seal, thereby, stopping reverse flow. When the pressure of the fluid in the inlet side exceeds the cracking pressure, the ball is dislodged from its seat and allows flow to occur. When the inlet pressure doesn't exceed the cracking pressure, or there is back pressure, the ball will close with the back pressure or via the spring, effectively closing the orifice.
Fíor 4: Comhla seiceála liathróid luchtaithe earraigh leis an gcalafort inlet ar chlé agus an calafort asraonta ar dheis.
Diaphragm
Diaphragm check valves consist of a rubber diaphragm that flexes open when the inlet pressure is increased. Normally, these types of valves have a free-floating self-centering diaphragm, which makes them normally open (NO). These means that there is no "cracking pressure", however, they can be normally closed (NC) and then it requires an inlet pressure to overcome the diaphragms elasticity. Figure 5 on the left shows a normally open diaphragm check valve as there is 'minimal' inlet pressure and the media still gets through. As inlet pressure increases, the diaphragm will flex open more allowing flow through, as seen in Figure 5 in the middle. If backpressure occurs (or it is a normally closed diaphragm check valve) the diaphragm will be forced against the opening and seal it to prevent any backflow, as seen in Figure 5 on the right. Due to the normally open nature, diaphragm check valves are ideal for low-pressure or vacuum applications.
Ardaigh
Is éard atá i gcomhla seiceála ardaitheoir ná diosca treoraithe a ardaíonn (ardaitheoirí) suas as suíochán na comhla chun sreabhadh meán a cheadú. Teastaíonn brú scoilte uaidh chun domhantarraingt agus/nó lingeán a shárú agus coimeádann an treoirleabhar an diosca i líne cheartingearach, ionas gur féidir an diosca a athshuí leis an ailíniú ceart agus leis an séala ceart. Go coitianta, éilíonn comhlaí seiceála ardaitheoir go ndéanann na meáin cas 90-céim, mar atá le feiceáil i bhFíor 6, ach tá comhlaí seiceála ardaitheoir atá inlíne nó ar uillinn. De réir mar a laghdaíonn an brú inlet faoi bhun an bhrú scoilte nó go bhfuil cúlbhrú ann, dúnfaidh an comhla trí dhomhantarraingt, san earrach, agus/nó trí úsáid a bhaint as an gcúlbhrú. Mura bhfuil sprionga ann chun cabhrú le dúnadh, tá an treoshuíomh gléasta maidir le domhantarraingt tábhachtach lena chinntiú go stopfar an diosca le meáchanlár.
Swing
Swing check valves are also commonly referred to as 'tilting-disc' check valves. They consist of a disc that is on a hinge (or trunnion) that swings open with an inlet pressure. As inlet pressure decreases or there is a backflow, the disc will swing shut. If there is no spring to assist in closing, mounting orientation in regard to gravity is important to ensure that the disc will swing shut with gravity. Figure 7 shows an example of a swing check valve.
Stop
Go hiondúil is comhla seiceála stoptha y-lódála sprionga nó comhla seiceála ardaithe í, ach tá gné sáraithe láimhe aici. Ligeann sé seo dóibh feidhmiú mar ghnáthchomhla seiceála agus cosc a chur ar ais-sreabhadh, áfach, tá meicníocht sheachtrach ann a fhéadfar a úsáid chun é a shárú agus an comhla a choinneáil i stát oscailte nó dúnta. Mar sin, is féidir leis an gcomhla seo feidhmiú mar dhá chomhla i gceann amháin. Úsáidtear iad go coitianta i ngléasraí cumhachta, scaipeadh coire, gineadóirí gaile, fuarú tuirbín, córais sábháilteachta.
Féileacán nó Wafer
Is féidir comhlaí seiceála féileacán agus comhlaí seiceála sliseog a úsáid go hidirmhalartaithe. Is éard atá iontu diosca stíl féileacán, nó sliseog, atá ar inse agus sprionga. Nuair a sháraíonn brú inlet an brú scoilte, osclaíonn an dá thaobh, mar atá le feiceáil i bhFíor 9. Nuair a laghdaítear an brú inlet nó nuair a bhíonn backflow ann, dúnfaidh an t-earrach ar an hinge (nó backpressure) an diosca go héifeachtach ina saothraítear rónta é. Ceadaíonn an cineál comhla seo sreabhadh meán díreach le bacainn íosta.
Comhlaí Seiceáil le haghaidh Uisce
Úsáidtear comhlaí seiceála in go leor feidhmeanna uisce, amhail feidhmeanna uisce óil agus fuíolluisce, agus tugtar comhlaí uisce aontreo orthu go simplí. Maidir le hiarratais ar uisce óil, cinntíonn siad nach féidir le haon mheáin ón gcomhshaol (taobh asraonta na comhla) dul isteach sa chóras leis an uisce óil glan sábháilte agus é a éilliú. Maidir le feidhmeanna fuíolluisce, cinntíonn siad nach féidir leis an bhfuíolluisce dul isteach arís sa chóras agus go gcruthóidh sé ró-shreabhadh nó éilliú breise. I gcás feidhmeanna caidéalaithe uisce, is minic a úsáidtear comhla chos chun a chinntiú nach dtiocfaidh aon bhruscar isteach sa líne agus chun brú inmheánach a choinneáil chun críocha príomhúla. Is féidir comhlaí duckbill a úsáid freisin le haghaidh sceitheadh ar línte uisce. Cinntíonn comhlaí seiceála caidéil sump nach dtiocfaidh an t-uisce scaoilte ar ais isteach sa chaidéal sump le domhantarraingthe nuair a bhíonn an caidéal múchta.
Comhla Seiceála Aeroibrithe
Ligeann comhla seiceála aeroibrithe, nó comhla seiceála aeir, sreabhadh an aeir isteach agus cuireann sé cosc air dul amach. Is minic nach dtugtar ach comhlaí aeir aontreo orthu. Is é an t-iarratas is coitianta ná comhbhrúiteoir aeir. Ligeann siad don chomhbhrúiteoir páirteanna áirithe a choinneáil faoi bhrú agus páirteanna eile dí-faoi bhrú. Is féidir iad a bheith suite ar chomhbhrúiteoir loine (inlet agus asraon), glacadóir aer, píopa urscaoilte, etc.
Ceisteanna Coitianta
Cad é siombail an chomhla seiceála?
The check valve symbol can be seen in Figure 13. It points in the orientation that it allows the flow with a vertical line showing it doesn't allow backflow.
Fíor 13: Siombail comhla seiceála
Cad é an cuspóir atá le comhla seiceála?
Is é príomhchuspóir comhla seiceála i gcóras ná cosc a chur ar ais-sreabhadh, rud a d'fhéadfadh damáiste a dhéanamh do threalamh nó meáin in aghaidh an tsrutha a éilliú.
Cad iad na fadhbanna coitianta comhla seiceála?
Common check valve problems are: noise, water hammer, vibration, reverse flow, sticking, leakage, and component wear/damage. To prevent issues, it is crucial that a check valve is specified correctly for the application and media. The two most common issues due to improper specification are reverse flow and water hammer. For both issues, a fast-closing check valve should be used. Reverse flow can occur if the check valve doesn't close fast enough and water hammer can occur if pressure surges occur causing shock waves within the media.
An stopfaidh comhla seiceála casúr uisce?
Is féidir le comhla seiceála casúr uisce a chosc má tá sé ag gníomhú go tapa. Coscann sé seo borrthaí brú, rud a chruthaíonn tonnta turrainge ar fud an mheáin. Is féidir leis na tonnta turrainge seo damáiste a dhéanamh do threalamh, tacaí píopaí, agus fiú píblínte réabtha de bharr an chreathadh.
Cén treoshuíomh ba cheart comhla seiceála a shuiteáil?
Is gá comhlaí seiceála a shuiteáil de réir a n-inlet agus asraon, a léirítear go minic mar saighead ar an tithíocht comhla. Toisc nach gceadaíonn siad ach sreabhadh i dtreo amháin, má shuiteáiltear iad ar ais, ní oibreoidh siad i gceart. Maidir le cothrománach nó ingearach, braitheann sé ar do chineál dearadh comhla. Má tá earrach aige, tá aon treoshuíomh ceart go leor. Mura bhfuil earrach ann, is féidir le domhantarraingthe difear a dhéanamh ar oibriú comhla seiceála, agus mar sin cinnteoidh a chinntiú go bhfuil a fhios agat na comhpháirteanna istigh go ndéanfaidh tú é a shuiteáil i gceart ar bhealach cothrománach nó ingearach.
Cén fáth nach bhfuil mo chomhla seiceála ag obair?
When a check valve doesn't work, it allows backflow. Three possible reasons for this are: sticking, leakage, or slow closing. If there isn't a filter in the line, dirt or debris can be trapped between the disc and body keeping it open. Due to wear or corroding media on the material, the disc or seat can become damaged or torn preventing a proper seal and allowing backflow. If the valve closes too slow, minimal backflow can enter before a proper seal can occur. Ensure that gravity is helping the design, and/or your spring is quick enough to close the valve rapidly.
Clibeanna Te: luascadh seic comhla
