JXZ331 Self pressure regulating valve - Shaoguan Boilz Control Valve Manufacture Co.,Ltd

JXZ331 Self pressure regulating valve: * with special taps, installation more simple and reliable
* pressure setting point of a small range and mutual staggered, easy to use
* rated Kv has a large capacity type, standard type, high precision three optional
* self pressure regulating valve does not need additional energy, which is convenient and saves energy
* pressure setting is convenient, running can be continuously without interference to set, maintenance free use
*The pressure compensation device is designed to eliminate the influence of the pressure fluctuation on the set point precision, and the adjustment is more stable

Technical parameter
Installation dimensions
Model description
Working Principle

Structure class	Self contained
structure type	Bellows balance type, double valve seat balance type, sleeve balance type
Spool type	Pressure balance type
Flow characteristics	Fast open, equal percentage, linear
pressure	1.6~32MPa, ANSI150~2500, 10K~63K
Size	DN20～500
Applicable temperature	-190～+450℃
Leak standard	IV、V、VI class
Connection type	Flange, thread, welding
actuator	Pneumatic diaphragm type, piston type

Product structure drawing

main parameters

DN(mm)		20	25	32	40	50	65	80	100	125	150	200
Rated flow coefficient Kv	Large capacity type	7	11	20	30	48	75	120	190	300	480	760
	Standard type	5	7	11	20	30	48	75	120	190	300	480
	High Accurancy Type	2.8	5	7	11	20	30	48	75	120	190	300
Rated travelL（mm)		8		10		14	20		25	40		50
Pressure PN（Mpa）		1.6 、4.0 、6.4 、10K 、16K 、20K 、ANSI150 、ANSI300
Inherent flow characteristic		quick open
Inherently adjustable ratioR		30
Set point pressure adjustment range（Kpa）		15～50 40～80 60～100 80～140 120～180 160～220 200～260 240～300 280～350 330～400 380～450 430～500 480～560 540～620 600～700 680～800 780～900 880～1000 950～1500 1000～2500 2000～3000 2500～3500
Adjustment precision（%）		Rubber diaphragm：±5 Piston type, metal diaphragm：±10
Maximum operating temperature（℃）		-30～185 -30～350 250～560

Model		Description
JX331 Self pressure regulating valve
Actuator	a	diaphragm type
Actuator	b	Piston type
Size	DN	DN15-DN500
upstream pressure	Mpa	xx Mpa
downstream pressure	Mpa	xx Mpa
Material	1	WCB
	2	WC6
	3	WC9
	4	CF3
	5	CF8
	6	CF8M
	7	CF3M
pressure	PN	PN10-PN64

working principle
Post valve pressure control

Working medium of the valve before the pressure P1 through the spool, after the throttle valve seat, into the valve after the pressure P2. P2 through the control line input to the actuator chamber under the effect of film in the top tray, the generated force and the spring reaction force equilibrium determines the relative position of the valve, the valve seat control valve pressure. When the valve after the pressure P2 increases, the force P2 acting on the top plate also increased. At this point, the top tray force greater than the spring reaction force, so that the valve is closed to the position of the valve seat, until the top plate of the force and the spring reaction force equilibrium. At this time, the flow area of the valve core and the valve seat is reduced, and the flow resistance becomes large, so that the P2 is reduced to a set value. Similarly, when the valve after the pressure P2 lower, the role of the direction and the opposite, which is self operated (after the valve) pressure regulating valve working principle.

Valve front pressure control
Working medium of the valve before the pressure P1 through the spool, after the throttle valve seat, into the valve after the pressure P2. While P1 through the control line input to the actuator effect on the membrane interior on the top tray, the generated force and the spring reaction force equilibrium determines the relative position of the valve, the valve seat, the control valve before the pressure. When the valve before the pressure P1 increases, the force P1 acting on the top plate also increased. At this point, the top tray force greater than the spring reaction force, the valve core to leave the seat to move in the direction of, until the top plate of the force and the spring reaction force balance so far. At this time, the valve core and the valve seat of the flow area increases, the flow resistance becomes small, so that the P1 down to the set value. Similarly, when the valve before the pressure P1 lower, the role of the direction and the opposite, which is self operated (valve front) pressure regulating valve working principle.
Working principle of self operated temperature control valve (heating)

Temperature control valve is based on the liquid can not be compressed and the principle of expansion and contraction. Heating with self operated temperature control valve, when the controlled object temperature is lower than the set temperature, temperature of liquid contraction, in the implementation of the push rod force decreases, components of the spool under the action of spring force opens the valve to increase the flow of steam and hot oil heating medium, the control object, the temperature rise, until the temperature of the controlled object to the set value, valve is closed, after the valve is closed, controlled object, the temperature drop, the valve open, heating medium and into the heat exchanger, and the temperature rise, so that the temperature of the controlled object to a constant value. The valve opening size is related to the difference between the actual temperature and the set temperature of the controlled object.

Working principle of self operated temperature control valve (cooling type)

Cooling with self operated temperature control valve works can refer to heating with self operated temperature control valve, only when the valve core component in the implementation of the device and the action of the spring force to open and close off the valve and the temperature contrast, the valve body through the cold medium, mainly used in cooling device of temperature control.