Plovákové expanzní ventily
Product types shown: 4
HFI
HFI is a high pressure float valve with internal liquid measuring device. The float valve is designed for direct flange mounting or welding on to plate heat exchanger type condensers as illustrated in Figure: Plate heat exchanger.
HFI is direct acting, therefore no differential pressure is required to activate the valve.
HFI is robust and reliable due to its simple design. The float valve is equipped with a purge valve for purging non condensable gases e.g. air from the top of the valve housing. This feature is also useful if the valve has to be serviced.
The HFI is available with two external connections on the housing for drainage and pressure equalizations.
PMFL / PMFH / SV
For modulating liquid level control in refrigeration, freezing and air conditioning plant, a system comprising a liquid level regulating valve type PMFL or PMFH, controlled by a pilot float valve type SV, is used.
PMFL and SV systems are used on the evaporator side. PMFH and SV systems are used on the condenser side.
The system is suitable for use with ammonia or fluorinated refrigerants. The PMFL and PMFH can be used in liquid lines to or from- evaporators
- separators
- intermediate coolers
- condensers
- receivers
Modulating liquid level regulation provides liquid injection that is proportional to the actual capacity. This gives a constant amount of flash gas, thus ensuring stable regulation and economic operation because variations in pressure and temperature are held to a minimum.
SV 1 / SV 3
Several float valves are available for Industrial refrigeration liquid level control in the product group “Liquid level regulating valves”, such as HFI and SV series. The SV series contains the following types: SV 1, SV 3, SV 4, SV 5 and SV 6, some of which can be delivered as dedicated “E” versions for hydrocarbon application.
The SV 1 and SV 3 can be used separately as a modulating liquid level regulator in refrigerating, freezing and air conditioning systems for ammonia or fluorinated refrigerants. However, in most cases, the SV is used as a float pilot valve for the main expansion valve type PMFH.
The SV 1 and SV 3 are used as liquid level regulators in either low pressure applications or in high pressure applications. Adaptation to the specific application is done by the orientation of the valve and thereby the float functions.
