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Other Pneumatic Valves

Bellow type control valve with pneumatic actuator

Min. Order: 1 Set
Delivery time: 25 days
Production Capacity: 1000 set/Month
Payment Terms: L/C, T/T, D/P, Western Union, Paypal, Money Gram
Product description: Bellow type control valve with pneumatic actuator can control the flow rate of high-strength corrosive media such as acid and alkali, as well as toxic and volatile gas and liquid media, so it is widel
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Introduction

Bellow type control valve with pneumatic actuator can control the flow rate of high-strength corrosive media such as acid and alkali, as well as toxic and volatile gas and liquid media, so it is widely used in chemical industry, metallurgy, medicine and other industries.

Features

1. It has compact structure, light weight and sensitive action;
2. The fluid channel is S streamlined, the pressure drop loss is small, and the valve capacity is large;
3. The parts of the valve body in contact with corrosive media are made of corrosion-resistant and anti-aging polyperfluoroethylene propylene;
4. High-pressure lining fluorine plastic technology, and adopts polytetrafluoroethylene bellows sealing.

How diaphragm type pneumatic actuator works

The actuator is an important part of the automatic control system in the production process of the pneumatic control valve. It has two forms of action, AIR TO OPEN and AIR TO CLOSE.

AIR TO OPEN:

When the signal pressure increases, the push rod goes inside of the membrane chamber. In case that there is emergency of air or electric failure, it will automatically close the valve and keep the normally closed position ( Figure 2a).

AIR TO CLOSE:

When the signal pressure increases, the push rod go inside of the membrane chamber. In case that there is an emergency of air or electric failure, the valves will stay in normally open position ( Figure 2b).

Specifications

Nominal diameter mm		20				25	32	40	50	65	80		100	125	150	200	250	300
Seat diameter mm		10	12	15	20	25	32	40	50	65	80		100	125	150	200	250	300
Rated flow coefficient Kv	Linear	1.8	2.8	4.4	6.9	11	17.6	27.5	44	69	110		176	275	440	690	1100	1760
Rated flow coefficient Kv	equal percentage	1.6	2.5	4	6.3	10	16	25	40	63	100		160	250	400	630	1000	1600
Nominal pressure MPa		0.6, 1.0, 1.6, 2.5
stroke mm		10				16		25		40				60			100
Diaphragm effective area Ae (cm)		280						400		630				1000			16000
Flow characteristics		Straight line, equal percentage
Working temperature ℃		-30 ℃ ~+150 ℃
Inherent adjustable ratio R		50:1
Signal rangePr		20~100, 40~200, 20~60, 60~100, 80~240
Air source pressure MPa		0.14, 0.4
Allowable differential pressure MPa	Unlimited belt locator	5.3	3.7	23	13	0.85	0.74	0.47	0.30	0.27		0.18	0.11	0.12	0.08	0.05	0.04	0.03
Allowable differential pressure MPa	with locator	6.4	6.4	5.5	3.01	2	1.7	1.1	0.71	0.63		0.41	0.26	0.28	0.20	0.11	0.08	0.05
Takeover thread		M16*15

Main performance

project

General regulating valve

Medium temperature (flexible graphite packing) or bellows-sealed regulators

without locator

with locator

without locator

with locator

Basic knowledge difference %

±5

±1

±15

±4

Return difference %

±3

±1

±10

dead zone%

±3

±0.4

±8

Always point deviation %

open air

starting point

±2.5

±1

±6

±2.5

end

±5

±15

Qiguan

starting point

±5

±15

end

±5

±6

Rated formation deviation %

2.5

allowable leakage

Adjustable L/h

10-4×valve rated capacity JP

Adjust the shut-off valve

Seat Diameter

100

150

200

250

300

allowable leakage

Soft Seal: Class VI

Rated flow coefficient deviation%

±10

Inherent flow characteristic deviation

Comply with the slope requirements specified in IEC534-1976 and GB/T 13927

Main parts

Part Name	Material
valve body, valve cover	HT200, ZG230~450, ZG1Cr18Ni9Ti
lining material	F46, F4, F3, PO, PE, X, X3, PFA
Spool	1Cr18Ni9Ti
Bellows	PTFE
filler	PTFE, flexible graphite
spring	60Si2Mn
Membrane cover	A3
valve stem, push rod	2Cr13/1Cr18Ni9Ti
bushing	2Cr13