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The design of the YW-VRV® sampler for liquids centres on the needle assembly. It consists of a housing in which two needles are mounted. In standard practice, the longer needle is connected to the process.
The shorter needle is used to vent out the air displaced by the incoming fluid, which is sometimes mixed with gas or vapour.
The vent connection prevents a build up of pressure in the sample container. The vent line should remain open at all times therefore placing valves in the vent outlet should be avoided. To prevent any unwanted backflow of the waste system when the sampler is not in use a check valve could be installed.
MODELS
VTA
The VTA design (vent to air) allows the air from the bottle to be vented directly to the atmosphere.
VTO
The VTO design (vent to outlet) provides a fitting connection to the vent needle. In this way the vent needle can lead to a waste system, wet collector, scrubber, activated carbon container, or back to the process if the process pressure allows.
Sample/Ventilation Needle Specifications
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Item No. |
Sample Needle |
Ventilation Needle |
|
1 |
065 |
083 |
|
2 |
083 |
083 |
|
3 |
109 |
083 |
|
4 |
148 |
083 |
|
5 |
203 |
083 |
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