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閥門應用建議
日期:2009-12-01 點擊:2601
  

通常應用于開啟-關閉場合,不推薦用于節流應用。

 Gate valves are normally used for on-off service and are not recommended for throttling service.

通常安裝在水平管道上,閥桿垂直向上。也可以安裝在垂直管道或者閥桿不是垂直向上的水平管道上,但是根據的通徑大小、應用環境和材料的具體情況,可能要求特殊的結構。如果購買的準備采用特殊的安裝方式,則在訂購時,應該說明閥門的朝向。

Gate valves are normally installed in horizontal pipe runs with the stem vertical. They can also be installed in vertical or horizontal pipe runs with the stem other than vertical, but may require special construction depending on valve size, service conditions and materials. WHEN PURCHASING VALVES FOR OTHER THAN NORMAL INSTALLATION, THE VALVE ORIENTATION SHOULD BE SPECIFIED.

 對于溫度超過260oC的應用環境,建議采用柔性或拼合式楔形閘板,避免楔形閘板由于熱膨脹而被卡住。這種情況在閥門冷關閉而后熱開啟狀態下可能發生。

 Flexible or split wedges are recommended for service above 500oF to avoid wedge binding due to thermal expansion. This may occur if the valve is closed when cold, and then heated to operating temperature.

當用于高速流體(湍流)或熱循環應用時,為了避免松開,螺紋閥座環應該鎖焊在閥體上。請在訂購時加以指定說明。

Threaded seat rings should be lock welded to the body when used in high velocity (turbulent) or thermal cycling services to avoid loosening. Please specify.

在以足夠的力量關閉后,閥桿應該稍微回轉(1/8至1/4圈),以釋放閥桿負載。這使得閥桿能夠稍微膨脹,不會卡住或損壞,也不會影響關閉效果。

After closing a gate valve with sufficient force to develop shutoff, the stem should be backed off slightly (1/8 to 1/4 turn) to relieve stem load. This will enable the stem to expand slightly without binding or damaging the valve and will not affect shutoff.

如果拆卸掉閥座環安裝耳柄,則高度整體性關閉可以用在熱水出口或采用軟鐵的管道系統中。在訂購時請加以指定說明。

 High Integrity Shutoff gate valves can be used for hot tapping or in pipeline services where a soft pig is used if the seat ring installation lugs are removed. Please specify.

通常在安裝時,要讓流體流進和壓力位于閥瓣的下方。如果流體流進是在另一個方向,那么在安裝之前,要與制造商進行確認。在某些特定的應用條件下,或者配置缸體或電動馬達執行機構,那么設計和安裝,讓流體從閥瓣上方流進,就可能具有成本低的優點。如果執行機構是根據這些條件進行選型,則必須小心謹慎,確保安裝正確。

 Globe valves are normally installed with flow and pressure under the disc. Always check with the manufacturer before installing valves with flow in the other direction. Under certain service conditions or when valves are equipped with cylinders or electric motor actuators, there may be a cost advantage in the designing and installing the valves with flow over the disc. If actuators are sized for these conditions, care must be taken to assure valves are installed correctly.

 當用于高速流體(湍流)或熱循環應用時,為了避免松開,螺紋閥座環應該鎖焊在閥體上。請在訂購時加以指定說明。

 Threaded seat rings in valves in services with high velocity (turbulent) flow or thermal cycling should be lock welded to the body to avoid loosening. Please specify.

 通常適用于大多數節流應用,并且當管線流速(英尺/秒)不超過240(v是流體介質的特定流量英尺3/磅)時,使用壽命也是最長的。不建議長期在開啟度小于10%狀態下用于節流應用,因為可能產生劇烈的振動、噪音,并且損壞閥瓣和閥座。采用流量較小的更小通徑的或V型端口閥內件,可以增加閥門開啟度,從而避免造成損壞。連續嚴酷的節流應用可能要求采用控制閥。

Conventional globe valves are suitable for most throttling applications and will provide the greatest service life where pipe line velocity in FT/SEC does not exceed 240. (v is a specific volume of flowing medium, ft.3/lb.) Prolonged throttling at less than 10% open is not recommended due to the possibility of excessive vibration, noise and damage to disc and seats. Use of smaller valves or V-Port trim with lower flow capacity may permit the valve to be open at a greater percentage, thus avoiding damage. Continuous severe throttling applications may require a control valve.

 截流的應用建議和局限性

Service Recommendations and Limitations of Stop Check Valves

截流最適用于低流速或中流速應用環境。截流的通徑正確計算選擇非常重要。管線流速太低或太高都可能損壞閥內件,縮短的使用壽命。

 Stop-check valves are best suited for low to moderate velocity applications. Correct sizing of stop-check valves is important. Either too low a line velocity or too high a velocity can damage valve internals and shorten valve life.

應該避免應用在頻繁出現流體倒流和間斷的應用系統中。截流應該安裝在離泵和壓縮機盡可能遠的地方。如果懷疑系統可能有問題,則在選型和訂購截流之前,應該與西博思公司一起重新審核管道系統。

Service in systems involving frequent flow reversals and pulsation should be avoided. Stop-check valves should be located as far away from equipment such as pumps and compressors as possible. Suspected problem systems should be reviewed with Pacific Valves before selecting and purchasing stop-check valves.

當用于高速流體(湍流)或熱循環應用時,為了避免松開,螺紋閥座環應該鎖焊在閥體上。請在訂購時加以指定說明。

 Threaded seat rings in valves in services with high velocity (turbulent) flow or thermal cycling should be lock welded to the body to avoid loosening. Please specify.

旋啟式應用建議 Service Recommendations for Swing Check Valves

旋啟式最適用于中流速應用環境。旋啟式通徑的正確計算和選擇非常重要。管線流速太低或太高都可能損壞閥內件,縮短閥門的使用壽命。

 Swing check valves are best suited for moderate velocity applications. Correct sizing of swing check valves is important. Either too low a line velocity or too high a velocity can damage valve internals and shorten valve life. See sizing recommendations on page

應該避免應用在高流速,頻繁倒流,間斷或劇烈湍流的應用系統中。旋啟式應該安裝應該遠離彎頭等其它設備,這樣通常可以減少或消除這些設備可能產生的問題。如果懷疑系統可能有問題,則在選型和訂購旋啟式之前,應該與西博思公司一起重新審核管道系統。

Service in systems involving rapid and frequent flow reversals, pulsation or excessively turbulent flow should be avoided. Locating swing check valves away from elbows, equipment, etc., within the piping system can often minimize or eliminate problems caused by this type of application. Suspected problem systems should be reviewed with Pacific Valves before selecting and purchasing swing check valves.

旋啟式通常適用于安裝在水平管道上。如果閥瓣止回結構能夠利用流體輕微的支撐住閥瓣,則這種也可以應用在垂直管道上(僅限于流向朝上)。如果準備用在垂直管道上,在訂購時應該明確指定說明。

 Swing check valves are normally designed for installation in horizontal pipe runs. When disc stops are designed to hold the disc slightly into the flow stream, the valves may also be used in vertical pipe runs (with flow up only). When valves are to be used in vertical pipe runs, this should be clearly specified.

一般來說,外置杠桿和壓鐵對于通徑大于DN160的旋啟式,并無法有效防止的拍擊現象。

Generally, outside lever and weights are not effective in preventing slamming of swing check valves in sizes above 6".

當用于高速流體(湍流)或熱循環應用時,為了避免松開,螺紋閥座環應該鎖焊在閥體上。請在訂購時加以指定說明。

Threaded seat rings in valves in services with high velocity (turbulent) flow or thermal cycling should be lock welded to the body to avoid loosening. Please specify.

 
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