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UK NORGREN Novo throttle valve installation and maintenance matters

British NORGREN Novo Threshold Definition:

A throttle valve is a valve that controls the flow of a fluid by changing a throttle section or a throttle length. The throttle valve and the check valve are connected in parallel to form a one-way throttle valve. The throttle valve and the one-way throttle valve are simple flow control valves. In the hydraulic system of the fixed pump, the throttle valve and the relief valve cooperate to form three throttling speed control systems, that is, the throttle throttle speed regulation System, return oil throttle control system and bypass throttle speed control system. The throttle valve has no negative flow feedback function and cannot compensate for the instability caused by the load change. It is generally only used in applications where the load does not change much or the speed stability is not high.

Characteristics of the British NORGREN Novo Threshold Valve

1. The structure is simple, easy to manufacture and maintain, and the cost is low. 2, the adjustment accuracy is not high, can not be used for adjustment. 3. The sealing surface is easy to be eroded and cannot be used for cutting media. 4. The sealing is poor.

The following items should be noted for the installation and maintenance of the throttle valve:

This valve often requires operation and should therefore be installed in an easy-to-operate position. When installing, pay attention to the direction of the media and the direction of the arrow marked on the valve body.

UK NORGREN Novo crown orifice blockage reasons:

1. The mechanical impurities in the oil or the colloid, asphalt, carbon residue and the like deposited by the oxidation are accumulated in the throttle gap.

2. Due to aging of the oil or the generation of charged polarized molecules after being squeezed, and there is a potential difference on the metal surface of the throttling gap, the polarized molecules are adsorbed to the surface of the gap to form a strong boundary adsorption layer, and the thickness of the adsorption layer It is generally 5 to 8 microns, thus affecting the size of the throttling gap. When the above deposits and adsorbates grow to a certain thickness, they are washed away by the liquid flow and then reattached to the valve port. This cycle, the flow of the flow is formed.

3. When the valve port pressure difference is large, the temperature of the valve port is high, the degree of liquid being squeezed is enhanced, and the metal surface is more susceptible to friction to form a potential difference, so that the pressure difference is likely to cause clogging.

UK NORGREN Novo crown measures to reduce congestion at the orifice

1. Select a thin blade orifice with a large hydraulic radius.

2. Precision filtration and regular oil change.

3. Appropriately reduce the pressure difference before and after the throttle.

4. Use metal materials with small potential difference, select oil with good oxidation stability, and reduce the surface roughness of the orifice.

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