Product classification of Kaiweixi

KAI WEI XI CHAN PIN FEN LEI

Pneumatic Diaphragm Double-seated Straight-through Control Valve
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Pneumatic Diaphragm Double-seated Straight-through Control Valve

Model：ZMA-BN-16C/ZMA-BN-25C/ZMA-BN-40C/ZMA-BN-64C/ZMA-BN-16P/ZMA-BN-25P/ZMA-BN-40P/ZMA-BN-64P/ZMA-BN-16R/ZMA-BN-25R/ZMA-BN-40R/ZMA-BN-64R
Specification：DN20-DN300
Temperature：-250~560℃
Medium：Gas, liquid, steam

Pressure：PN16,PN25,PN40,PN64
Connection method：flange
Driving method： pneumatic
Material：Cast Steel,Stainless Steel,Duplex Stainless Steel

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Pneumatic Diaphragm Double-seated Straight-through Control ValveOverview

ZMA/BN series pneumatic diaphragm straight-through double-seated regulating valve is an industrial process control execution unit composed of a multi-spring pneumatic diaphragm actuator and a straight-through double-seated balanced valve body. The valve receives pneumatic signals from the control system or analog current signals (4-20mA) via a positioner to convert air pressure into linear displacement of the actuator stem, driving the valve stem to move the upper and lower plugs relative to the seats. Due to the double-plug structure, the fluid forces acting on the upper and lower plugs are opposite in direction and similar in magnitude, allowing most of the unbalanced force to be offset. Consequently, this valve features high allowable pressure differential, large flow capacity, and excellent dynamic stability, making it particularly suitable for industrial automation systems with high flow rates, high pressure drops, and relatively relaxed leakage requirements.

Product Image of ZMA/BN Pneumatic Diaphragm Straight-through Double-seated Regulating Valve

Pneumatic Diaphragm Double-seated Straight-through Control ValveCharacteristic

1. Excellent force balance performance:The dual-seat plug design utilizes the principle of mutual cancellation of unbalanced forces generated by the medium pressure on the upper and lower plugs, significantly reducing the required output thrust of the actuator and allowing the valve to easily handle high pressure drop conditions.
2.Significant flow capacity:The straight-through double-port flow path design provides a larger flow coefficient (Kv value) than a single-seated valve of the same nominal diameter, enabling more efficient handling of high-volume industrial fluid delivery.
3.Strong dynamic stability:Due to the minimal unbalanced force, the valve plug experiences low fluid disturbance during regulation, effectively suppressing mechanical vibration and fluid noise for smooth operation.
4.Flexible and safe drive modes:Equipped with high-performance pneumatic diaphragm actuators, the valve can be configured as air-to-open (ZMAN, fail-close) or air-to-close (ZMBN, fail-open) to ensure system safety in the event of air supply failure.
5.Intrinsic explosion-proof safety:The adjustment process is driven by compressed air without electrical sparks, offering inherent safety attributes ideal for petrochemical, gas, and other flammable or explosive environments.
6.Mature and durable structure:Utilizing classic top and side guiding structures, the components offer excellent interchangeability. Precision-machined plugs and seats with various material options can adapt to water, oil, steam, and general corrosive media.
7.Various bonnet types:Standard, extended (radiator type), or bellows-sealed bonnets can be provided based on medium temperature to meet wide temperature ranges and strict sealing requirements for toxic or volatile media.
8.Convenient maintenance:Key internals adopt a standardized design, making disassembly, cleaning, and replacement of wearing parts relatively easy, ensuring long-term continuous operation while reducing comprehensive maintenance costs.

Pneumatic Diaphragm Double-seated Straight-through Control Valvestructure principle

Structural Drawing of ZMA/BN Pneumatic Diaphragm Straight-through Double-seated Regulating Valve

List of Component Names and Materials

Name	Material
Valve body	Cast Steel,Stainless Steel,Duplex Stainless Steel
Valve cover	HT200, ZG230-450, ZG1Cr18Ni9Ti
Valve core	1Cr18Ni9Ti, Stellite overlay welding
Valve seat	1Cr18Ni9Ti, Stellite overlay welding
Soft sealed valve core	Enhanced PTFE
Packing	PTFE, flexible graphite, stainless steel bellows
Gasket	Rubber asbestos board, 1Cr18Ni9Ti, graphite spiral wound gasket
Diaphragm cover	A3
Bellows diaphragm	Nitrile rubber, enhanced polyester fabric
Spring	60Si2Mn
Valve stem/Push rod	2Cr13, 1Cr18Ni9Ti
Bushing	2Cr13

Pneumatic Diaphragm Double-seated Straight-through Control Valvetechnology parameter

Performance Specification Sheet

Performance Specification Sheet
Nominal Pressure	1.6	2.5	4.0	6.4	MPa
Strength test pressure	2.4	3.8	6.0	9.6
Sealing test pressure	1.76	2.8	4.4	7.04
Applicable Temperature	-250-560				℃

Pneumatic Diaphragm Double-seated Straight-through Control Valvestandard size

Standard requirements for external dimensions

1. The structural length of the valve shall comply with the standard of GB/T12221

2. Connecting flanges according to GB/T17241.6 standard

Outline Drawing of ZMA/BN Pneumatic Diaphragm Straight-through Double-seated Regulating Valve

Outline dimension table(Unit: mm)

Nominal Diameter(DN)		20	25	32	40	50	65	80	100	125	150	200	250	300
Flange Distance(L)	PN16	180	185	200	220	250	275	305	350	410	450	550	670	770
	PN40	185	190	210	230	255	285	310	355	425	460	560	690	795
	PN64	190	200	220	240	265	295	320	370	400	475	570	752	819
Room temperature valve coverH1	Single Seat	560	567	579	622	652	802	818	826	1054	1079	1144	1517	1658
Room temperature valve coverH1	Double Seat		577	583	642	652	822	852	876	1104	1129	1124	1637	1758
Medium Temp Type Bonnet H1	Single Seat	760	767	779	822	852	1052	1062	1076	1347	1399	1464	1867	2008
Medium Temp Type Bonnet H1	Double Seat		777	783	842	852	1072	1102	1126	1424	1449	1524	2023	2108
H2	Single Seat	91	112	118	129	144	173	191	195	243	251	290	380	436
H2	Double Seat		117	120	139	144	188	208	220	268	278	320	441	465
A		282					360			470			620
Flange Standard		GB ；1.6、2.5、4.0、6.4Mpa ANSI:150、300、600Lb JIS：10K、20K、30K

Notes:

(1) The values in this table are based on PN1.6.

(2) The height with the handwheel mechanism should be increased by 150mm（DN20～50）、180mm（DN65～100）、250mm（DN125～200）、280mm（DN250～300）

Articles related to technology research and development

Dynamic balance electric control valve Patent

The utility model provides a dynamically balanced electric regulating valve, which includes a valve body, a valve cover, a valve rod, a valve core installed inside the valve body and connected to the valve rod, and an actuator installed on the valve cover and connected to the top end of the valve rod. The valve body is internally provided with a water inlet chamber, a valve cavity, and a water outlet chamber in order towards the direction of medium flow. The valve core is in the shape of a bucket with its opening facing downwards. The valve core is located inside the valve cavity and is used for connecting or cutting off between the water inlet chamber and the valve cavity. The top of the valve core is provided with a through port for medium circulation. Above the through port, there is a filter cover detachably connected to the valve core. The valve rod is provided with a step, and the outside of the step is covered with an elastic sleeve that fits it. The top of the filter cover is provided with a fixing hole that fits the elastic sleeve. This utility model can filter the medium, is simple to install, time-saving, labor-saving, and can reduce the medium pressure inside the valve body, extending the service life of the valve core.
1. A dynamic balance electric regulating valve, comprising a valve body, a valve cover, a valve rod, a valve core installed inside the valve body and connected to the valve rod, and an actuator installed on the valve cover and connected to the top end of the valve rod. Its characteristic lies in that the valve body is sequentially provided with an inlet chamber, a valve cavity, and an outlet chamber in the direction of medium flow. The valve core is in the shape of a bucket with an opening facing downwards. The valve core is located inside the valve cavity and is used for connecting or cutting off between the inlet chamber and the valve cavity. The top of the valve core is provided with a port for medium circulation. Above the port, there is a filter cover detachably connected to the valve core. The valve rod is provided with a step, and the outside of the step is covered with an elastic sleeve that fits it. The top of the filter cover is provided with a fixing hole that fits the elastic sleeve.
2. A dynamic balance electric regulating valve according to claim 1, characterized in that the bottom of the valve body is provided with a downward-opening groove, which is connected to the valve cavity through a through hole. A bottom cover connected to the valve body is arranged below the groove, and a pressure relief mechanism is arranged inside the groove. The pressure relief mechanism comprises a force-receiving member, a pressure plate connected to the force-receiving member, and a first spring arranged below the pressure plate and abutting against the bottom cover. The force-receiving member comprises a flow diversion block protruding from the through hole and a connecting rod connected to the flow diversion block, and the connecting rod passes through the pressure plate and is locked and fixed by a nut.
3. A dynamic balance electric regulating valve according to claim 2, characterized in that the top end of the pressure plate is pressed against the top wall of the groove, the bottom of the pressure plate is provided with a boss, and the top end of the first spring is sleeved on the boss.
4. A dynamic balance electric control valve according to claim 1, characterized in that the valve rod is arranged through the valve cover, a sealing cover threadedly connected to the valve cover is sleeved on the valve rod, a convex ring abutting against the valve cover is arranged on the outer circumferential wall of the sealing cover, a nut cover threadedly connected to the sealing cover is arranged at the connection between the sealing cover and the valve rod, an installation groove is arranged at the connection between the nut cover and the valve rod, a plurality of O-rings adapted to the valve rod are stacked in the installation groove, and a packing gland threadedly connected to the installation groove is arranged above the O-rings.
5. A dynamic balance electric control valve according to claim 4, characterized in that a second spring is arranged between the packing gland and the O-ring.
6. A dynamic balance electric control valve according to claim 5, characterized in that a sealing ring adapted to the valve rod is arranged inside the nut cover below the installation groove.
7. A dynamic balance electric control valve according to claim 6, characterized in that the bottom of the sealing cover is provided with a thrust ring that is threadedly connected to the sealing cover and abuts against the bottom end of the valve cover.
8. A dynamic balance electric regulating valve according to claim 1, characterized in that the top surface of the elastic sleeve is higher than the top surface of the filter cover.
9. A dynamic balance electric control valve according to claim 8, characterized in that the filter cover is connected to the valve core through threads.

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Product classification of Kaiweixi

KAI WEI XI CHAN PIN FEN LEI

Pneumatic Diaphragm Double-seated Straight-through Control Valve

More Pneumatic Control Valve>>

More control valve>>

More valve>>

Pneumatic Diaphragm Double-seated Straight-through Control Valve