Pneumatic Diaphragm Small Flow Control Valve

• Temperature: Low/High/Normal Temperature
• Certification: GS, CE, ISO9001
• Media: Liquid/Steam
• Standard: Standard
• Connection Mode: Flange
• Power: Pneumatic
• Model NO.: ZMAY; ZMBY
• Material: Stainless Steel
• Type: Single Seater
• Norminal Pressure: Pn16; Pn40; Pn64MPa
• Manner: Single Seat Casting Ball Type Type
• Transport Package: Wooden Packing
• Specification: DN25mm
• Trademark: ZT
• Origin: China
• HS Code: 8481202000

Product Description

Pneumatic Diaphragm Small Flow Control Valve (ZMA (B) Y)

Summary:
ZMA (B) Y pneumatic diaphragm small flow control valve is a small diameter control valve developed for small flow regulation, which can be used for precise control of small flow. It has the characteristics of compact structure, small volume, light weight, easy installation and maintenance. When adjusting the dirty medium, it should be aimed at the problem of small throttle clearance, and pay attention to prevent blocking phenomenon. The valve is widely used in liquid and steam medium main flow regulation occasions.

Pneumatic Diaphragm Small Flow Control Valve
Model	ZMAY; ZMBY
Size	DN25mm
Structure Form	Single Seat Plunger Type
Body Material	Stainless Steel (304;316;316L)
Norminal Pressure	PN16; PN40; PN64MPa
Working Temperature	Standard Type: -40~230ºC; Radiating Type: 230~450ºC
Application Range	Liquid, steam and other media of small diameter occasions
Feature	Compact structure, small size, light weight, easy installation and maintenance
Action	Air closing(B)-Air failure, valve to open(FO); Air opening(K)-Air failure, valve to close(FC)
Accessory	Posilioner/Air Filtralion /Pressure Reducing Valve /Transmilter/Handwheel

 

Body Specification
Manner	Single Seat Plunger Casting Type
Nominal diameter	DN25mm
Flange Standard	JB/T79.1-94,792-94,etc.
Body Material	Cast steel; Fluorine PTFE(F46)
Working Temperature	Standard Type: -40~230ºC; Radiating Type: 230~450ºC
Bonnet Type	Bolted type
Packing Material	V-type PTFE Packing;PTFE+Graphite packing;Asbestos Textile Packing;  Graphite Packing.

 

Components Valve Trim
Plug Type	Single Seat Plunger Casting Type
Flow Characteristic	Linear Characteristics
Plug Material	Stainless Steel; Surfacing Stellite Alloy; Titanium, etc.

 

Actuator Specification
Manner			ZHA/B Mutil-spring Diaphragm Actuator
Model			ZHA/B-11
Diaphragm material			EPDM+N; NBR+N
Range of Spring(MPa)			20-100(Standard);20-60; 60-100; 40-200; 80-240
Supply Pressure(MPa)			140-400
Air connection			RC-1/4"
Environment Temperature			-30-70ºC
Model	ZHA/B-22	ZHA/B-23	ZHA/B-34	ZHA/B-45	ZHA/B-56
Active Area (cm²)	200
Stroke(mm)	10

Features:
Pneumaticdiaphragm small flow control valve is tailored for some special conditions of electric control valve. It is made of forged valve body forging, and is easy to make high-voltage electric control valve. The size of the spool can be 0.15-15mm from the machining difference. It can be used in different flow conditions. There is a servo amplifier in the electric actuator, no additional servo amplifier is required. It has input control signal (4~20mADC or 1 ~ 5VDC) and single-phase power supply, which can control the operation and realize the adjustment of parameters such as flow rate.

Principle:
Pneumatic small flow control valve input 4-20ma signal to change the valve opening change, so as to change the closure area of the valve, and achieves the purpose of flow change. It takes the compressed air as the power, through the electric valve positioner to control the size of the air source pressure, so that the air acts on the rubber diaphragm of the valve. The contraction and expansion of the diaphragm drives the stem up and down to control the medium. Regulator (DCS) signal goes through the electrical valve locator, and the electrical signal into a gas signal acting on the regulator diaphragm. Diaphragm compression spring drives the valve core action to control the valve opening, so as to achieve the adjustment of the medium. According to the process requirements, the control valve is divided into gas open valve (fault close) and gas close valve (fault open).

Pneumatic small flow control valve has a top guide system to overcome the vibration of small open, which makes the service life longer. Smaller meteor coefficients are selected to add the use of the valve. When the Kv value is small, the valve is used for precise control of small flow occasions, such as fine chemical industry, food additives, medicine, electronics and other industries.

Company Introduction:   
Zhitai Valve Co., Ltd is a member of Valve Association of Longwan District, is located in Longwan Central Industrial Zone, Wenzhou City. It'a professional technology company integrated with development, manufacturing, sales, and after-sales services of valve actuators and and self-controlled valves. Presently, our main products include: pneumatic actuators, pneumatic valves and pneumatic control valves; electric actuators, electeic valves and eletric control valves; automatic control products. Our products are widely applied in natural gas, electricity, petroleum, chemical, metallurgical, construction, pharmacy, paper, printing and dying. Zhitai series actuators and valves are the best choice for automatic fluid control engineering and equipment manufacturing. We sincerely welcome customers from home and abrode to visit us for supervision, communication and cooperation. It's a great honor for us to cooperate with you.