Summary

The30D04Y/30D04R self-operated differential pressure control valve is composed of the control valve ，actuator and a spring used for pressure setting。

It is suitable for controling differential pressure in the pipes of non-crrosive liquids gases and steams. when the diferential pressure rises, the control valve is opened

The main features are as follows:

1.It has the pressure balancing Function with high sensitivity.

2.Low noise, reliable performance free of maintenance

3.The standard modular design is adopted.

4.Various combined controls can be carried out through the assemblies                                                                                                           

Body

DN		15、20、25、32、40、50、65、80、100、125、150、200、250mm
PN		Class150、300
Flange standard		ANSI、JIS、DIN GB JB(special standards can be offered according to user requirements)
Body material		WCB、CF8、CF3、CF8M、CF3M
Plug material	Hard seal	Stainless steel (304、316、316L)
	Soft seal	Stainless steel embedded with rubber ring
Pressure balancing		Stainless steel bellows (DN15~125), balanced diaphragm (DN150~250)

Actuator

Effective area (cm2)	80	250	630
Pressure setting range	0.1~0.6 0.05~0.3	0.015~0.15 0.01~0.07	0.005~0.035
Minimum differential pressure that ensures normal work of the pressure valve	≥0.04	≥0.01	≥0.005
Allowable maximum differential pressure between the upper a nd lower diaphragm chambers	1.25	0.4	0.15
Material	Diaphragm cover: galvanized steel sheet; Diaphragm: EPDM or FKM with fiber
Control pipeline connection	Copper pipe or steel pipe Φ10X 1(mm); Ferrule connection: R1/4"

Performance

Set value error		±8%
Allowable leakage (under stipulated testing conditions)	Hard seal	4×0.01% valve rated capacity
	Soft seal	DN15~50	DN65-DN125	DN150~250
		10 bubbles/ min	20 bubbles/min	40 bubbles/min

Structural figure

1Body	2Seat	3 Valve shaft	4 Bonnet	5 Diaphragm cover	6 Diaphragm
7 Spring	8 Adjusting nut	9 Bellows	10Balanced diaphragm	11Charging valve

Allowable working temperature

DN		15~125mm	150~250mm
seal type	Hard seal	≤150℃	≤140℃
		Cooling tank≤200℃	Cooling tank and extension ≤200℃
		Cooling tan k and heat sink ≤350℃※	Cooling tank and extension ≤300℃※
	Soft seal	≤150℃

Note: ※It indicates the allowable working temperature is valid only when the medium is steam

and the body with PN40 shall be adopted w hen the temperature resistance is 350℃.

Rated flow coefficient, noise measuring coefficient, allowable differential pressure

DN		15	20	25	32	40	50	65	80	100	125	150	200	250
Rated flow coefficient		4	6.3	8	16	20	32	50	80	125	160	280	320	450
Noise measuring coefficient Z value		0.6	0.6	0.6	0.55	0.55	0.5	0.5	0.45	0.4	0.35	0.3	0.2	0.2
Allowable differential	PN16	1.6								1.5		1.2	1
pressure (Mpa)	PN40	2

Working principle

After throttling by the plug and seat, the before-valve pressure P1 of the process medium is changed into the after-valve pressure P2. Through the control pipeline, P1 is input to the upper diaphragm chamber of the actuator and acts on the top disc.

The acting force produced balances the reacting force of the spring, determining relative positions of the plug and seat and controlling the before-valve pressure. W hen the before-valve pressure P1 increases, the acting force of P1 that acts on the top disc will increase accordingly.

At the time, the acting force on the top disc is higher than the reacting force of the spring to make the plug move away from the seat, until the acting force on the top disc balances the reacting force of the spring. At the time, the flow area between the plug and seat is increased, the flow resistance becomes lower and P1 is reduced to the set value. Likewise, when the before-valve pressure P1 decreases, the acting direction is reverse to the above. This is the working principle during the control of before-valve pressure.

When it is necessary to change the set value of before-valve pressure P1, please adjust the adjusting nut.  

I. Dimensions and weight of control valve

DN (mm)	15	20	25	32	40	50	65	80	100	125	150	200	250
L  (mm)	130	150	160	180	200	230	290	310	350	400	480	600	730
B  (mm)	212	212	238	238	240	240	275	275	380	380	326	354	404
Weight (Kg)	6.2	6.7	9.7	13	14	17	29	33	60	70	80	140	220
B1(mm)	—	—	—	—	—	—	—	—	—	—	630	855	1205
Weigh(Kg)	—	—	—	—	—	—	—	—	—	—	140	210	300

II. Dimensions and weight of actuator

Effective area (cm )	32	80	250	630
R   (mm)	172	172	263	380
H   (mm)	435	430	470	520
Weight(Kg)	7.5	7.5	13	28