Introduction to common valves for fermenters

Introduction to common valves for fermenters

Fermenter is divided into two types of valves

Due to the cleanliness of valves, valves used in various types of factories are generally divided into two categories: one for opening and closing, either fully open or fully closed; and one for throttling control such as flow, pressure and temperature. adjust.

Fermenter utility pipeline

Gate valves, ball valves and butterfly wides for utility systems such as water, steam and air are mainly used for opening and closing, while globe valves and butterfly valves are used for throttling control. Valve selection is based primarily on installation and maintenance costs, with little or no consideration of the cleanliness of the valve.

Fermenter process pipeline

The valve body structure of the gate valve and the shutoff valve prevents them from remaining clean. The choice of such a process valve has in most cases been reduced to whether it is a diaphragm valve or a ball valve and a butterfly valve. From a clean point of view, no valve can be compared to a diaphragm valve. The diaphragm valve is simple in structure, and the valve body and diaphragm materials are various and can be widely applied to various fluids.


Diaphragm valve for fermenter

Some unique characteristics of the diaphragm valve for fermenter make it widely applicable in the field of bioengineering for the following reasons: 1 Only the valve body and the diaphragm are in contact with the stream, and the other parts are all isolated, and the valve can be completely sterilized by steam; 2 has its own drainage capacity; 3 can be repaired online; 4 large diameter range (DN8-DNl00), can basically meet the needs of the bioengineering field. Diaphragm valves have the ability to self-discharge, which is one of the main reasons for its wide application in bioengineering. The installation angle of the diaphragm valve on the horizontal pipe is directly related to its own discharge capacity. The installation angle is related to the manufacturer and manufacturing method of the valve, usually 19 to 45 degrees.

Fermenter ball valve




The ball valve has the advantage of 90 degree rotation and quick opening and closing. However, since the valve core cannot be completely sterilized, it can only be applied to some pipelines with low cleanliness requirements. In the enzyme preparation factory, the most used is a three-piece ball valve made of 316L.

Combined air filtration system

The butterfly valve has the advantages of simple structure, small size and light weight. The disadvantage of this valve is that the maximum operating temperature can only reach 95 ° C due to the sealing material.


Bottom valve

There is almost no room for choice in the discharge valve at the bottom of the tank, usually in one form (as shown below). The foot valve is welded directly to the bottom head of the tank during equipment manufacture. It is very different from the commonly used method of making a nozzle at the bottom of the tank and then connecting the valve at the nozzle. Since the valve is closed when the valve is closed, the valve core is flush with the inner bottom of the tank, so it effectively eliminates the tank. The dead angle inside, so that all the liquid in the tank can be fully mixed in the fermentation process, coupled with the unique steam sealing system, greatly reducing the possibility of product contamination.



Common faults and preventive measures for fermenter valves

1. Stuffing box leakage

The reasons are as follows: 1 The filler is not compatible with the corrosiveness, temperature and pressure of the working medium; 2 The filling method is wrong, especially when the whole packing is hovered, the most likely to cause leakage; 3 The valve stem processing precision or surface finish is not enough , or have ovality, or nicks; 4 stem has been pitting, or rust due to lack of protection in the open air; 5 stem bending; 6 filler used for too long, has been aging; 7 operation is too improper.

2. Closed parts leak

There are two types: one is the leakage of the sealing surface, and the other is the leakage of the root of the sealing ring. This kind of leakage, which we often encounter when we overhaul equipment and pipelines, will increase the length of inspection time or the area that affects the production unit.

3. Valve stem lift failure

1 operation is too strong to make thread damage; 2 lack of lubrication or lubricant failure; 3 stem bending; 4 surface finish is not enough; 5 mismatched tolerance, bite too tight; 6 stem nut tilt; 7 material selection is not appropriate, for example The valve stem and the stem nut are of the same material and are easy to bite; the 8 thread is corroded by the medium (referring to the dark rod valve or the valve stem nut at the lower part of the valve); 9 the open air valve lacks protection, the stem thread is covered with dust sand, or The rain, frost and snow are rusted.

3. Gasket leakage

The main reason: the gasket is not resistant to corrosion, does not adapt to the working temperature and working pressure, and does not adapt to the temperature change of the high temperature valve.

4. Valve body cracking

Usually caused by freezing. When the weather is cold, the valve should have heat preservation and heat tracing measures. Otherwise, the water in the valve and the connecting pipe should be drained after the production is stopped (if there is a plug at the bottom of the valve, the wire plug can be opened).

5. Handwheel damage

Impact or long lever violent operation. Avoid the heavy bar operation and impact.

6. Filler gland break

The force is not uniform when the packing is pressed, or the gland is generally defective in cast iron. To compress the packing, rotate the screws symmetrically. Not biased. When manufacturing, not only should pay attention to large and key parts, but also pay attention to secondary parts such as gland, otherwise it will affect the use.

7. Valve stem and valve plate connection failure

The gate valve adopts a large number of square stems connected to the T-shaped groove of the gate, and the T-shaped groove sometimes does not process, so that the long square head of the valve stem wears faster. It is mainly solved from the manufacturing side, but the T-slot can also be processed to give it a certain degree of finish.

8. The gate of the double gate valve cannot be pressed tightly.

The tension of the double gate is generated by the top wedge. Some gate valves have poor top wedge material (low grade cast iron), which will wear or break soon after use. The top wedge is a small piece. The material used is not much. It can be made of carbon steel and replaced with the original cast iron.

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