30W02 nitrogen sealing device

The company has obtained certifications such as TS equipment A1 level, CE, API 607, TR-CU, SIL3, etc.

Classification：

30 series self operated control valve

E-mail: sunny@reowocv.com

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Product Description

Summary
The 30W02 nitrogen sealing device is composed of the control valve, actuator, pressure spring, pilot, pulse pipe and other parts.
It is mainly used for maintaining the pressure of gas (generally nitrogen) at the top of the vessel constant so as to prevent the materials in the vessel from contacting the air, volatizing and being oxidized and ensure vessel safety.
It is especially suitable for gas sealing protection systems of various large‑sized storage tanks. The product has such features as energy saving, agile action, reliable running, convenient operation and maintenance, etc. It is widely used in petroleum, chemical industry, etc.

Technical parameters andperformances

Body
DN		DN20、25、32、40、50、65、80、100mm
PN		PN1.6, 4.0, 6.4MPa
Flange standard		JB/T79.1-94、79.2-94
Body material		Cast iron (HT200, cast steel (ZG230-450), cast stainless steel (ZG1Cr18Ni9Ti, ZG1Cr18Ni12Mo2Ti)
Plug type		Single-seat (P), double-seat (N), sleeve (M)
Plug material	Hard seal Soft seal	Stainless steel (1Cr18Ni9Ti, 1Cr18Ni12Mo2Ti) Stainless steel embedded with rubber ring
Stem material		Stainless steel (1Cr18Ni9Ti, 1Cr18Ni12Mo2Ti)
Pressure balancing		Stainless steel bellows
Flow characteristic		Quick open
Working temperature		≤80°C

Actuator

Pressure setting range	0.4~0.5 5~10 9~14 13~19 18~ 24 22~28 27~33 36~44 42~51 49~58 56~66
Diaphragm cover material	Teflon coated A3, A4 steel sheet
Diaphragm material	NBR, EPR, fluorine rubber, oil resistant rubber

1. Main valve	2. Main valve plug	3. Main valve actuator
4. Pressure reducing valve	5. Throttle valve	6. Pilot plug
7. Detection mechanism	8. Preset spring

1.Main valve

2.Detection mechanism

3.Spring

Performance

Set value error	±5°C
Allowable leakage	Standard type	Class IV (conforming to GB/T4312-92)
Allowable leakage	Tight type	Class VI (conforming to GB/T4312-92)

Rated flow coefficient, rated travel, performance

30W02-01 nitrogen supply device

DN	25									32	40	50	65	80	100
Seat size	5	5	7	8	10	12	15	20	25	32	40	50	65	80	100
Flowcoefficient	0.2	0.32	0.5	0.8	1.8	2.8	4.4	6.9	11	20	30	48	75	120	190
Rated travel	8									10		14	20		25

30W02-02 nitrogen discharge device

DN	20	25	32	40	50	65	80	100
Seat size	20	25	32	40	50	65	80	100
Flowcoefficient	6.9	11	20	30	48	75	120	190
Rated travel	8		10		14	20		25

Working principle

In the nitrogen supply device (see figure 1), the medium at the pressure point at the top of the tank is introduced to the detection mechanism (7) through the pressure pipe. The medium produces an acting force on the detection element, which balances the pre‑tightening force of the preset spring (8). When the pressure in the tank drops to be lower than the pressure set point of the nitrogen supply device, the balance is destroyed, so that the pilot plug (6) is opened, and the before‑valve gas enters the upper and lower diaphragm chambers of the main valve actuator (3) after passing through the pressure reducing valve (4) and throttle valve (5). The main valve plug (2) is opened and nitrogen is filled into the tank. When the pressure in the tank rises to the pressure set point of the nitrogen supply device, the pilot plug (6) is closed by the preset spring force. Due to the spring action in the main valve actuator, the main valve is closed and nitrogen supply is stopped.
The nitrogen discharge device (see figure 2) is an internal feedback mechanism. The medium enters the detection mechanism (2) after passing through the bonnet. The medium produces an acting force on the detection element, which balances the pre‑tightening force of the spring (3). When the pressure in the tank rises to be higher than the pressure set point of the nitrogen discharge device, the balance is destroyed, so that the plug (1) moves upward to open the valve and discharge nitrogen to the outside. When the pressure in the tank falls to the pressure set point of the nitrogen discharge device, the valve is closed by the preset spring force.

1. Outline dimensions and weight of nitrogen supply device

DN(mm)	25	32	40	50	65	80	100
L	160	180	200	230	290	310	350
A	308	308	308	308	394	394	394
H2	415	415	415	115	415	415	415
H1	60	75	80	85	95	105	120
H	720	730	730	750	790	840	890
Weight(kg)	32	35	40	50	90	115	280