before pressure control valve from China manufacturer - NINGBO TISUN VALVE INDUSTRIES CO.,LIMITED

Price:	50.0~100.0 USD
Payment Terms:	T/T,L/C,D/A,D/P,WU
Place of Origin:	Zhejiang, China (Mainland)


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Product Detail

Model No.: TISUN BPPCV

Production Capacity: 50-100 each month

Delivery Date: as per the quantity

Standard or Nonstandard: Standard

Structure: Ball

Temperature of Media: Others

Brand Name: TISUN

Exp Region:: America, Europea, east asia

Means of Transport: Ocean,Land,Air

Packing: WODDEN CATTON

Power: Others

Pressure: Others

Material: Stainless Steel

Media: Others

functions:: for control

pilot-operated (after valve) pressure control valve is composed of the control valve ,pilot and actuator .

pilot-operated (before valve) pressure control valve is composed of the

control valve ,pilot and actuator. 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.High control precision

Technical parameters and performances

Body

DN	DN15 20 25 32 40 50 65 80 100 125 200 250mm
PN	PN1.6 4 .0MPa
Flange standard	ANSI JIS DIN GB JB(special standards can be offered according to user requirements)
Body material	Cast iron (HT200), cast steel (ZG230-450), cast stainless steel (ZG1Cr18Ni9Ti, ZG1Cr18Ni12Mo2T i)
Plug material	Hard seal	Stainless steel (1Cr18Ni9Ti, 1Cr18Ni12Mo2Ti)
	Soft seal	Stainless steel embedded with rubber ring
Pressure balancing	Stainless steel bellows (DN15~125), balanced diaphragm (DN150~250)

Actuator

Effective area (cm2)	250
Pressure setting range	0.01~0.12 0.08~0.25 0.2~0.5 0.45~1 0.6~2.0
Minimum differential pressure that ensures normal work of the pressure valve	DN15~125is 0.08 DN150~250is 0.1
Allowable maximum differential pressure between the upper and lower diaphragm chambers	0.4
Material	galvanized steel sheet; diaphragm: EPDM or FKM with fiber
Control pipeline connection	Copper pipe o r steel pipe Φ10X 1(mm); ferrule connect ion: R1/4"

Note: ※T he pressure setting range corresponding to the effective area does not apply to valves with DN150-250.

Performance

Set value error	±4%
Allowable leakage (under stipulated testing conditions)	Hard seal	4x0.01% valve rated capacity
	Soft seal	DN15~50 DN65-DN625 DN150~250
		10 bubbles/ min 20 bubbles/min 40 bubbles/min

Set value error ±4%

Allowable leakage Hard seal 4x0.01% valve rated capacity

(under stipulated DN15~50 DN65~125 DN150~250

testing conditions) Soft seal 10 bubbles/min 20 bubbles/min 40 bubbles/min

Structural figure

1Body	2Seat	3 Stem	4 Before-valve pressure P1 pipe	5 Balanced bellows	6Travel indicator	7 Diaphragm	8 Spring
9 Operating pressure Ps pipe	10 After-valve pressure P2 pip	11 Pilot	12 Pilot plug	13Spring	14 Bellows	15 Adjusting screw	16 Adjustable needle 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

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	0.60	0.60	0.60	0.55	0.55	0.50	0.50	0.45	0.40	0.35	0.30	0.20	0.20
Allowable differential	PN16	1.60							1.50		1.20	1.00
pressure (Mpa)	PN40	2.00							1.50		1.20	1.00

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.