The common faults of valve electric actuator are as follows: the protection level of valve knowledge is low. The special electric actuator for valve matched with electric actuator is fully enclosed squirrel cage structure, short-time intermittent working system (10 minutes) self cooling type. The protection level required is also different due to different service conditions and environment of the valve. Low protection grade will cause damp in the inner cavity of the electric actuator or invasion of foreign matters such as dust, and damage caused by the decrease of insulation resistance of the electric actuator.

包裝、運(yùn)輸及保管不當(dāng)閥門(mén)電動(dòng)執(zhí)行器包裝應(yīng)有防雨、防潮、防塵措施。運(yùn)輸過(guò)程中應(yīng)有防雨措施，產(chǎn)品到現(xiàn)場(chǎng)后應(yīng)存放在通風(fēng)、干燥處，不得露天存放。禁止在陰雨天氣調(diào)試或檢修，調(diào)試完畢后要擰緊全部緊固件，以保證電氣部分密封嚴(yán)密可靠。

Improper packaging, transportation and storage. The packaging of valve electric actuator shall be provided with rain proof, moisture-proof and dust-proof measures. Rain proof measures shall be taken during transportation. After the products arrive at the site, they shall be stored in a ventilated and dry place and shall not be stored in the open air. Commissioning or maintenance in rainy weather is prohibited. After commissioning, all fasteners shall be tightened to ensure tight and reliable sealing of electrical parts.

良工閥門(mén)電動(dòng)執(zhí)行器選型與行程位置調(diào)整控制不當(dāng)閥門(mén)電動(dòng)執(zhí)行器有兩個(gè)重要參數(shù)：?jiǎn)㈤]力矩值應(yīng)包括閥門(mén)實(shí)際工作扭矩值加上閥門(mén)自身扭矩值，啟閉力矩大小影響閥門(mén)使用，力大易壞，力小易漏。在選型配套上應(yīng)有足夠的余量（一般要求大于閥門(mén)實(shí)際操作轉(zhuǎn)矩值1.1～1.3倍）。

The selection and stroke position adjustment of the electric actuator of Lianggong valve are not properly controlled. The electric actuator of the valve has two important parameters: the opening and closing torque value shall include the actual working torque value of the valve plus the torque value of the valve itself. The opening and closing torque affects the use of the valve. Large force is easy to break and small force is easy to leak. There shall be sufficient margin in type selection and matching (generally, it is required to be 1.1 ~ 1.3 times greater than the actual operating torque value of the valve).

行程位置控制與閥門(mén)口徑大小、啟閉時(shí)間長(zhǎng)短及結(jié)構(gòu)形式等有關(guān)。良工閥門(mén)電動(dòng)執(zhí)行器配套的電動(dòng)執(zhí)行器為專用電動(dòng)執(zhí)行器，短時(shí)工作制，時(shí)間10–15min。如在短時(shí)工作時(shí)間內(nèi)高負(fù)載，造成電動(dòng)執(zhí)行器發(fā)熱絕緣等級(jí)下降造成損壞。

The stroke position control is related to the valve diameter, opening and closing time and structural form. The electric actuator matched with the electric actuator of Lianggong valve is a special electric actuator with a short-time working system for 10 – 15min. In case of high load during short working hours, the electric actuator will be heated and the insulation grade will be reduced, resulting in damage.

閥門(mén)電動(dòng)執(zhí)行器與電動(dòng)執(zhí)行器型號(hào)不匹配所選的電動(dòng)執(zhí)行器型號(hào)與電動(dòng)執(zhí)行器要求不匹配，實(shí)際輸出力矩未留有足夠相應(yīng)的余量，超載荷運(yùn)轉(zhuǎn)時(shí)易造成電動(dòng)執(zhí)行器損壞。電器保護(hù)失靈，電器元件質(zhì)量差良工閥門(mén)電動(dòng)執(zhí)行器內(nèi)的微動(dòng)開(kāi)關(guān)是控制機(jī)構(gòu)的關(guān)鍵零部件，當(dāng)閥門(mén)過(guò)行程位置時(shí)，微動(dòng)開(kāi)關(guān)切斷電源，起過(guò)載保護(hù)作用。

The model of the electric actuator of the valve does not match the model of the electric actuator, the selected model of the electric actuator does not match the requirements of the electric actuator, and the actual output torque does not leave enough corresponding margin, which is easy to cause damage to the electric actuator during overload operation. The electrical protection fails and the quality of electrical components is poor. The microswitch in the electric actuator of Lianggong valve is the key part of the control mechanism. When the valve is in the over travel position, the microswitch cuts off the power supply and plays the role of overload protection.

大多數(shù)電動(dòng)執(zhí)行器廠家將行程與力矩保護(hù)串聯(lián)在一起，當(dāng)超行程或超力矩時(shí)，微動(dòng)開(kāi)關(guān)及時(shí)切斷交流接觸器線圈控制電源，從而切斷電動(dòng)執(zhí)行器主回路。調(diào)試安裝使用不當(dāng)閥門(mén)電動(dòng)執(zhí)行器分為水平安裝和垂直安裝兩種。在垂直安裝時(shí)電動(dòng)執(zhí)行器尾端在下方。

Most electric actuator manufacturers connect the travel and torque protection in series. When the travel or torque is exceeded, the microswitch will cut off the control power supply of the AC contactor coil in time, so as to cut off the main circuit of the electric actuator. Improper commissioning, installation and use of valve electric actuator can be divided into horizontal installation and vertical installation. When installed vertically, the tail end of the electric actuator is below.