进口自力式调节阀原理特点及品牌（图）

进口自力式调节阀无需外加能源，利用被调介质自身能量为动力源，引入执行机构控制阀芯位置，改弯两端的压差和流量，使阀前（或阀后）压力稳定。德国托马斯(Thomas)自力式调节阀具有动作灵敏，密封性好，压力设定点波动力小等优点，广泛应用于气体、液体及蒸汽介质减压稳压或泄压稳压的自动控制。

主要分类

1、直接作用式调节阀

又称为弹簧负载式调节阀，其结构内有弹性元件：如弹簧、波纹管、波纹管式的温包等，利用弹性力与反馈信号平衡的原理。

2、间接作用式调节阀

增加了一个指挥器（先导阀）它起到对反馈信号的放大作用然后通过执行机构，驱动主阀阀瓣运动达到改变阀开度的目的。

如果是压力调节阀，反馈信号就是阀的出口压力，通过信号管引入执行机构。

如果是流量调节阀，阀的出口处就有一个孔板（或者是其他阻力装置）由孔板两端取出压差信号引入执行机构。

如果是温度调节阀，阀的出口就有温度传感器（或者温包）通过温度传感器内介质的热胀冷缩驱动执行机构。

安装注意事项

1、阀在气体或低粘度液体介质中使用时，通常自力式调节阀为直立安装在水平管上，当位置空间不允许时才倒装或斜装。

2、为便于现场维修及操作，调压阀四周应留有适当空间。

3、当介质为洁净气体或液体时，阀前过滤器可不安装。

4、调压阀通径过大(DN≥100 时)，应有固定支架。

5、位置实在不允许时，旁通阀(手动)可以省略(我们不推荐)。

6、阀组后根据需要用户可选配止回阀、安全阀等。

7、阀在蒸汽或高粘度液体介质中使用时，通常自力式调节阀为倒立安装在水平管上，冷凝器(蒸汽用自力式)应高于调压阀的执行机构而低于阀前后接管。使用前冷凝器应灌满冷水，以后约 3个月灌水一次。

Self-regulating valve without additional energy, the use of the media itself as the power source, the introduction of the actuator control spool position, change the pressure and flow at both ends of the bend, so that the valve before (or valve) pressure stability. Germany Thomas (Thomas) self-regulating valve with action sensitive, good sealing, pressure set point wave power is small, widely used in gas, liquid and steam medium pressure regulator or pressure regulator automatic control.

Main classification

1, the direct role of regulating valve

Also known as the spring-loaded control valve, the structure of the elastic components: such as springs, bellows, bellows-style package, the use of elastic force and feedback signal balance principle.

2, indirect acting control valve

Added a pilot (pilot valve) which acts to amplify the feedback signal and then through the actuator to drive the main valve flap to achieve the purpose of changing the valve opening.

If the pressure regulating valve, the feedback signal is the valve outlet pressure, through the signal tube into the implementing agencies.

In the case of a flow control valve, there is an orifice plate (or other resistance means) at the outlet of the valve which is introduced into the actuator by removing the differential pressure signal from both ends of the orifice plate.

If it is a temperature control valve, the valve outlet has a temperature sensor (or temperature package) through the temperature sensor medium thermal expansion and contraction drive actuator.

Installation Precautions

1, the valve in the gas or low viscosity liquid medium used, usually self-regulating valve for the vertical installation of the horizontal tube, when the location space is not allowed when the flip or ramp loading.

2, in order to facilitate on-site maintenance and operation, pressure regulator should be left around the appropriate space.

3, when the medium is clean gas or liquid, the valve before the filter may not be installed.

4, the regulator valve diameter is too large (DN ≥ 100 hours), should have a fixed bracket.

5, the position is not allowed, the bypass valve (manual) can be omitted (we do not recommend).

6, after the valve group according to the needs of users optional check valve, safety valve.