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Pneumatic modulating type PFA lining Diaphragm Valve

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: Pneumatic diaphragm control valve is composed of a diaphragm valve equipped with a pneumatic diaphragm actuator. It has a simple structure, small flow resistance and larger flow capacity. It can be us
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Introduction

Pneumatic modulating type PFA lining diaphragm valve is composed of a diaphragm valve equipped with a pneumatic diaphragm actuator. It has a simple structure, small flow resistance and larger flow capacity. It can be used for the adjustment of high viscosity and suspended particle fluids. With PTFE or PFA lining they are suitable for regulating strong alkali and strong corrosive media.

Features:

1 . The diaphragm valve body has a smooth flow path without stuffing box on the bonnet;

2. Using compact actuators, the height and weight can be reduced by 30% ;

3. The surface of the valve body is lined with various lining materials to avoid direct contact with the medium and withstand the corrosion of the corrosive medium of the strong valve;

4. When the valve is closed, the internal and external leakage is zero, especially suitable for highly toxic media or valve sections that do not allow polluting media.

Specification

Nominal diameter mm	15	20	25	32	40	50	65	80	100
Rated flow coefficient Kv	8	12	16	28	60	68	90	160	300
Flow characteristics	Approximate quick opening characteristics
Nominal pressure MPa	1
Connection Type	Flange connection: PN1.0 according to JB78-59 standard
Equipped with actuator model	ZMA(B)-2			ZMA(B)-3			ZMA(B)-4
Effective area cm2	280			400			630
stroke mm	10			16		25		40
Mode of action	air-closed; air-open
Spring pressure range KPa	20～100 (standard), 40～200, 20～60, 60～100 can be selected
Air supply pressure KPa	Standard 0.14; optional 0.25, 0.40.24
Adjustable ratio R	30:1
Air supply connector	M16×1.5

Technical performance

project	Without valve positioner	with valve positioner
Basic main difference %	≤±10	≤±1
Return difference %	≤8	≤1
dead zone%	≤6	≤0.4
leakage	0.01%×valve rated capacity
Coefficient error % at rated flow	≤±10

Combination of Body Liner and Diaphragm Materials

Body material	lining material	Diaphragm material	Operating temperature	Applications
cast stainless steel	none	fluororubber	-20～200 ℃	General acids, alkalis, organic solvents and other media

Allowable differential pressure

Signal pressure KPa		120	140	120	140
Nominal diameter DN(mm)	Actuator effective area cm2	Maximum allowable pressure MPa when closed
15	280	0.9	1	0.45	0.9
20	280	0.9	1	0.45	0.9
25	280	0.4	0.8	0.2	0.4
32	400	0.4	0.8	0.2	0.4
40	400	0.3	0.6	0.15	0.3
50	400	0.2	0.4	0.1	0.2
65	630	0.2	0.4	0.1	0.2
80	630	0.1	0.2	0.05	0.1
100	630	0.05	0.1	0.02	0.05

Installation and use precautions

1. The pneumatic diaphragm valve should be installed vertically on the pipeline, and those with larger volume and weight should be supported and clamped when used in vibration situations ;

2. The pneumatic diaphragm valve should generally be provided with a bypass pipeline, so that it can be converted into bypass operation when the diaphragm fails or is repaired, so that the production process can be carried out normally;

3. In general unimportant occasions, the bypass pipeline can be omitted after installing the handwheel mechanism for manual operation, and the valve opening can be limited. When the handwheel mechanism is stopped, it should be restored to the original neutral position to avoid Conducive to the normal operation of the automatic control system ;

4. When cleaning the pipeline, the adjustment should be at the maximum opening in order to remove the dirt in the pipeline ;

5. If the valve body is lined with an anti-corrosion layer, when it is installed on the pipeline, a corrosion-resistant cushion should be used, and care should be taken not to damage the sealing surface of the valve body flange;

6 The diaphragm and lining should be checked regularly to prevent damage to other parts and accidents due to corrosion and rupture.

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