1用途
1. Purpose
控流閥是一種機械式流控型單向逆止閥。通常安裝在變壓器與儲油柜的聯(lián)管中，當變壓器由于內部故障或其它原因，引起油的大量外溢、泄漏時(shí)，控流閥具有“一排油即關(guān)閉”的功能，可立即切斷儲油柜與油箱間的油路，使儲油柜不再給油箱補油，是油浸電力變壓器理想的輔助安全保護裝置。
Flow control valve is mechanically controlled one-way check valve that can control the flow. It is normally installed onto the connection pipe between transformer and oil tank. When there is massive oil flowing out or leakage due to internal failure with transformer or for other reasons, such flow control valve will respond with "shutting off against oil release" so that oil supply between oil reservoir and oil tank can be cut off immediately. Consequently, oil reservoir will not provide any supply to oil tank. Therefore, it is ideal and auxiliary protection for oil immersed power transformer.
2 技術(shù)參數
2. Technical data
2.1公稱(chēng)通徑：ф80mm
2.1 Nominal diameter: ф80mm
2.2公稱(chēng)壓力：0.2Mpa
2.2 Nominal pressure: 0.2Mpa
2.3 適應溫度：-40°C~95°C
2.3 Applicable temperature: -40°C~95°C
2.4 最小關(guān)斷流速：0.3~0.5m/s
2.4 Min. cut-off flow rate: 0.3~0.5m/s
2.5 信號接點(diǎn)型式：常閉接點(diǎn)三付
2.5 Signal contact point: normally closed contact: 1 pair
2.6 接點(diǎn)容量：20VA
2.6 Contact capacity: 20VA
3.結構原理
3. Principle of construction
3.1控流閥由閥體、閥蓋、閥板、干簧接點(diǎn)及復位手柄等組成（如圖1所示），閥蓋上有接線(xiàn)盒，當變壓器正常運行時(shí)，閥板上的磁鐵5受支架4上的磁鐵吸引，閥板1處在約35°角的半開(kāi)位置；常閉干簧接點(diǎn)2受閥板上另一塊磁鐵的吸引，接點(diǎn)處在開(kāi)的位置，無(wú)信號輸出。
3.1 Flow control valve consists of valve body, valve bonnet, valve plate, dry-reed contact and reset handle (as seen in fig.1). Junction box is located on the valve bonnet. While transformer is in normal service, magnet 5 located on valve plate is attracted by the magnet on support 4. Valve plate 1 is projected at about 35° for half opening. Normally closed dry-reed contact 2 is in open position due to attraction by another magnet on valve plate. There is no signal output coming out of it.
3.2 當變壓器出現故障，有油流外瀉，且流速達到設定值時(shí)，閥板自動(dòng)關(guān)閉，儲油柜不再給變壓器油箱補油。
3.2 In case transformer has failure and there is oil release with flow rate reaching the setting, valve plate will automatically shut off so that oil reservoir will stop supply to oil tank of transformer.
3.3 閥板關(guān)閉后，干簧接點(diǎn)脫離磁鐵的吸引，接點(diǎn)閉合，通過(guò)接線(xiàn)盒3發(fā)出警報信號。
3.3 After valve plate is closed, dry-reed contact is not attracted by the magnet so that it closes. It will send out alarming signal through junction box 3.
3.4 變壓器正常運動(dòng)時(shí)，閥板能保持穩定的半開(kāi)狀態(tài)，一是靠磁鐵相互吸引；二是靠復位機構中的一拉簧支承，即使變壓器發(fā)生瞬間超壓或受到意外震動(dòng)，閥板也不會(huì )關(guān)閉。
3.4 While transformer is in normal service, valve plate can stably stay at half open for two reasons: mutual attraction between magnets and pulling by a spring of resetting mechanism. In case of transient overpressure or accidental vibration against transformer, the valve plate will not close up.
4 安裝與使用
4. Installation and operation
4.1控流閥的正確安裝方法是：將控流閥串接在儲油柜與變壓器的聯(lián)管中，閥體不應有傾斜，箭頭指向變壓器方向。
4.1 Correct installation of flow control valve: Set up flow control valve in serial connection to the connection pipe between oil reservoir and transformer. Valve body should not tilt. The arrow should point towards the transformer.
4.2 外接信號引線(xiàn)與接線(xiàn)端子相接，閥板處在開(kāi)通位置，干簧接點(diǎn)斷開(kāi)。
4.2 Signal out-lead should be connected to wire terminal. Valve plate is in engagement position and dry-reed contact is disengaged.
4.3 閥板關(guān)閉后無(wú)自動(dòng)復位功能，運行中如出現閥板關(guān)閉，應順時(shí)針?lè )较蜣D動(dòng)手柄，將閥板打開(kāi)，然后再逆時(shí)針?lè )较蜣D動(dòng)手柄，使其復位。
4.3 Once valve plate is closed off, it does not have auto reset function. In case valve plate closes during operation, open up the valve plate by turning the handle in clockwise direction. Then get it reset by turning the handle in counterclockwise direction.
4.4 手柄復位后，手柄應處在水平位置，并用螺釘鎖死手柄，以防止隨意搬動(dòng)，如果從儲油柜注油或從變壓器下面人為放油時(shí)，應順時(shí)針?lè )较蜣D動(dòng)手柄，使閥板打開(kāi)，并用螺釘鎖死手柄如圖2所示。
4.4 Once the handle is reset, it should stay horizontal. Lock the handle up with screw to avoid any unexpected operation. When oil is filled through oil reservoir or oil is manually released at bottom of the transformer, turn the handle in clockwise direction so that valve plate opens. Then lock it up with screw as seen in fig. 2.
5 運行維護
5. Maintenance
5.1 在正常運行中信號燈不應接通，如果信號燈接通，應進(jìn)行檢查。
5.1 During normal operation, signal light should not be switched on. Implement a check when signal light is switched on.
5.1.1 檢查閥板是否關(guān)閉，如手柄仍在正常開(kāi)通位置，說(shuō)明圖1中項2干簧接點(diǎn)沒(méi)有斷開(kāi)，此時(shí)應調整圖1中接點(diǎn)夾，使接點(diǎn)斷開(kāi)。
5.1.1 Check to see if valve plate is closed. If handle is still in engaged position as normal, it indicates the dry-reed contact for item 2 as in fig. 1 is not disengaged. In this case, make adjustment to contact in fig 1 so that such contact disengages.
5.1.2 檢查引線(xiàn)，如果有脫落或接觸不良現象，應接好引線(xiàn)，使信號回復正常。
5.1.2 Check up the lead wire. In case falloff or poor contact, repair the connection so that there is normal signal communication.
6 注意事項
6. Precautions
6.1 控流閥出廠(chǎng)后不得隨意拆卸或調整拉簧。
6.1 Dismantling or adjustment to pullback spring is prohibited after flow control valve is delivered out of factory.
6.2 如果拆卸閥芯，回裝后必須重新進(jìn)行流速整定試驗，其流速值必須滿(mǎn)足2.4規定上。
6.2 After valve spool is removed, please proper set up the flow rate and test it after assembly. Flow rate must fulfill requirement of 2.4.
7 改進(jìn)說(shuō)明
7. Notes to improvement
控流閥在原基礎上增加一個(gè)檔位開(kāi)啟、運行、關(guān)閉三個(gè)檔位，流速值不變，使用更加靈活、可靠。
Based on original arrangement, three positions are added to flow control valve: ON, Operation and OFF. Flow rate remains unchanged. Now flow valve is more flexible and reliable.
