ZMAN pneumatic two-seat regulating valve

Overview of pneumatic cryogenic two-seat regulating valve

Pneumatic film low temperature is a single seat, double seat deformation products. It is different from normal temperature in the use of long neck type upper valve cover, so that the packing works at normal temperature. It is suitable for the adjustment of medium (such as liquid oxygen, liquid nitrogen, etc.) under the low temperature and strong state of -60 ~ -250ºC. In order to ensure the accuracy of adjustment, a positioner must be used.
Pneumatic low temperature two-seat regulating valve structure principle:
Pneumatic low temperature is composed of pneumatic film actuator and low temperature resistant single and double seat valve. The signal pressure from the regulator is input into the air chamber of the pneumatic film actuator to generate thrust and pass through
The connecting rod drives the spool, and the change of the spool position changes the flow cross-sectional area of the valve to realize the adjustment of the medium flow.

Pneumatic low temperature double seat regulating valve main technical indicators regulating valve

Nominal diameter DN	Single seat	20										25	32	40	50	65	80	100	125	150	200
Double seater											25	32	40	50	65	80	100	125	150	200
Rated flow Coefficient Kv	Single seat	0.08	0.12	0.20	0.32	0.50	0.80	1.2	2.0	3.2	5.0	8	12	20	32	50	80	120	200	280	450
Double seater											10	6	25	40	63	100	160	250	400	630
Flow characteristics		Straight line						Straight lines; Equal percentage
Matching actuator model												ZMA-2		ZMA-3		ZMA-4			ZMA-5
Itinerary		10						10				16		25		40			60
Mode of action		Air close (B), Air open (K)
Spring pressure range KPa		Standard signal: 20 ~ 100; Other signals; 40 ~ 200; 20 to 60; 60 to 100

Pneumatic low temperature two-seat regulating valve precautions

1, should be installed vertically on the horizontal pipeline, in special cases need horizontal or inclined installation, generally should be supported. The garden plate installed on the wall of the incubator should be parallel to the wall of the incubator.
2. It should be installed near the ground or floor for maintenance and repair. For those equipped with positioner or handwheel mechanism, it should ensure observation, adjustment and operation and convenience.
3, generally set by-pass pipeline, in order to switch to manual operation when the automatic control system failure or maintenance, not to stop production.
4, equipped with a handwheel mechanism, can also omit the bypass pipeline manual operation, can also be used to limit the opening. When stopped in use, the handwheel mechanism must be restored to the original neutral position to facilitate the normal operation of the automatic control system.
5. When installing, the medium flow direction should be consistent with the direction indicated by the valve body.
6. Dirt and welding slag should be cleaned in the pipeline before installation. After installation, make it fully open, clean the pipeline, etc., and test the tightness of the joints. Regulating valve Regulating valve Regulating valve valve

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