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KAI WEI XI CHAN PIN FEN LEI

ZL Self-operated Flow Control Valve
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Phone：+86（577）6730 7899
Mobile：+86 195 1816 9569
Fax：+86（577）6738 7099
Email：Lucas@kaiweixi.com
Address：No. 1, Linxia Road, Oubei Street, Yongjia County, Wenzhou City, Zhejiang Province,china
Website：https://www.kaiweixi.com

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ZL Self-operated Flow Control Valve

Model：ZL-16C/ZL-25C/ZL-40C/ZL-16P/ZL-25P/ZL-40P/ZL-16R/ZL-25R/ZL-40R
Specification：DN15~250
Temperature：≤140℃
Medium：Automatic flow control for water, oil, and gas

Pressure：PN1.6～4.0MPa
Connection method：Flanged
Driving method：Self-operated
Material：Cast Steel,Stainless Steel,Duplex Stainless Steel

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ZL Self-operated Flow Control ValveOverview

The ZL self-operated flow control valve is an energy-saving device that utilizes the energy of the regulated medium itself to maintain a constant flow rate without the need for external power. The valve primarily consists of a regulating body, an actuator, and an orifice plate with preset resistance. Its operating principle involves a built-in pressure compensation mechanism that senses the differential pressure across the orifice in real-time. By automatically adjusting the plug opening to maintain a dynamic balance between the medium pressure and spring force, it ensures the output flow remains at the set value despite fluctuations in network pressure. The ZL series is widely used in district heating, central air conditioning chilled/hot water systems, and industrial circulating water systems as key equipment for resolving hydraulic imbalance and improving energy efficiency.

Product Image of ZL Self-operated Flow Control Valve

ZL Self-operated Flow Control ValveCharacteristic

1.No external power required:Directly utilizes the pressure energy of the medium for automatic regulation. Consuming no electricity or air supply significantly reduces supporting system costs and operating expenses, providing excellent energy-saving attributes.
2.Excellent pressure-independent characteristics:Equipped with high-sensitivity pressure-sensing diaphragms to effectively offset interference from network pressure fluctuations. Within the rated differential pressure range, the output flow remains stable regardless of upstream or downstream pressure changes.
3.High-precision constant flow control:Utilizes hydrodynamically optimized plug and cage structures for superior linearity and minimal dead zones. Flow error is typically maintained within ±5%, ensuring precise heat or cooling distribution across branches.
4.Simple and intuitive adjustment:Equipped with a clear flow setting dial or adjustment nut. Users can complete flow presetting on-site with simple rotation according to design requirements, eliminating the need for tedious manual pre-commissioning.
5.Durable and reliable material system:Bodies are available in cast steel or stainless steel. Key internals such as diaphragms, springs, and sealing pairs are made of corrosion-resistant and fatigue-resistant materials to ensure long-term sensitivity.
6.Significant noise reduction:Optimized flow path design and multi-hole throttling technology effectively reduce noise and vibration during high-velocity flow, extending the service life of the piping system and related instruments.
7.Intrinsic safety and low failure rate:The absence of complex electronic components or fragile moving parts results in a very low failure rate. The purely mechanical regulation ensures high reliability under harsh conditions.
8.Compact installation layout:The scientific connection between actuator and body ensures a small overall footprint. It can be flexibly arranged in heat exchange stations, building entrances, and terminal branches, greatly simplifying hydraulic balance design.

ZL Self-operated Flow Control Valvestructure principle

Structural Drawing of ZL Self-operated Flow Control Valve

List of Component Names and Materials

Item	Specification
Diaphragm Cover Material	A3, A3 steel coated with PTFE, Stainless steel. Packing: NBR, EPDM, FKM, Oil-resistant rubber (Customizable upon request)
Body Material	Cast steel (ZG230-450), Cast stainless steel (ZG1Cr18Ni9Ti, ZG1Cr18Ni12Mo2Ti)
Plug/Core Material	Hard seal: Stainless steel (1Cr18Ni9Ti, 1Cr18Ni12Mo2Ti); Soft seal: Stainless steel with inlaid rubber ring

ZL Self-operated Flow Control Valvetechnology parameter

Performance Specification Sheet

Performance Specification Sheet
Nominal Pressure	1.6	2.5	4.0	MPa
Strength test pressure	2.4	3.8	6.0
Sealing test pressure	1.76	2.8	4.4
Applicable Temperature	≤140			℃

ZL Self-operated Flow 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 ZL Self-operated Flow Control Valve

Outline dimension table（Unit：mm）

Nominal Diameter mm	15	20	25	32	40	50	65	80	100	125	150	200	250
L	130	150	160	180	200	230	290	310	350	400	480	600	730
H	50	52.5	57.5	75	75	85.5	92.5	100	110	142.5	158	170	640
H1	212	212	238	238	240	240	275	275	380	380	326	354	404
H2	-	-	-	-	-	-	-	-	-	-	326	354	404
H3	-	-	-	-	-	-	-	-	-	-	630	855	1205
H4	150
R	263

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

ZL Self-operated Flow Control Valve

More self-operated control valve>>

More control valve>>

More valve>>

ZL Self-operated Flow Control Valve