斷流閥,變壓器斷流閥,截止閥,止流閥,變壓器沖氮滅火裝置斷流閥

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(nèi)部故障或其它原因，引起油的大量外溢、泄漏時，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(shù)

2. Technical data

2.1公稱通徑：ф80mm

2.1 Nominal diameter: ф80mm

2.2公稱壓力：0.2Mpa

2.2 Nominal pressure: 0.2Mpa

2.3 適應(yīng)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 信號接點型式：常閉接點三付

2.5 Signal contact point: normally closed contact: 1 pair

2.6 接點容量：20VA

2.6 Contact capacity: 20VA

3.結(jié)構(gòu)原理

3. Principle of construction

3.1控流閥由閥體、閥蓋、閥板、干簧接點及復(fù)位手柄等組成（如圖1所示），閥蓋上有接線盒，當變壓器正常運行時，閥板上的磁鐵5受支架4上的磁鐵吸引，閥板1處在約35°角的半開位置；常閉干簧接點2受閥板上另一塊磁鐵的吸引，接點處在開的位置，無信號輸出。

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(xiàn)故障，有油流外瀉，且流速達到設(shè)定值時，閥板自動關(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，干簧接點脫離磁鐵的吸引，接點閉合，通過接線盒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 變壓器正常運動時，閥板能保持穩(wěn)定的半開狀態(tài)，一是靠磁鐵相互吸引；二是靠復(fù)位機構(gòu)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，閥板也不會關(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(yīng)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 外接信號引線與接線端子相接，閥板處在開通位置，干簧接點斷開。

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)閉后無自動復(fù)位功能，運行中如出現(xiàn)閥板關(guān)閉，應(yīng)順時針方向轉(zhuǎn)動手柄，將閥板打開，然后再逆時針方向轉(zhuǎn)動手柄，使其復(fù)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(fù)位后，手柄應(yīng)處在水平位置，并用螺釘鎖死手柄，以防止隨意搬動，如果從儲油柜注油或從變壓器下面人為放油時，應(yīng)順時針方向轉(zhuǎn)動手柄，使閥板打開，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(yīng)接通，如果信號燈接通，應(yīng)進行檢查。

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，如手柄仍在正常開通位置，說明圖1中項2干簧接點沒有斷開，此時應(yīng)調(diào)整圖1中接點夾，使接點斷開。

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，如果有脫落或接觸不良現(xiàn)象，應(yīng)接好引線，使信號回復(fù)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 控流閥出廠后不得隨意拆卸或調(diào)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，回裝后必須重新進行流速整定試驗，其流速值必須滿足2.4規(guī)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 改進說明

7. Notes to improvement

控流閥在原基礎(chǔ)上增加一個檔位開啟、運行、關(guān)閉三個檔位，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.