China Teflon Valves Manufacturers, Suppliers and Factory - Wholesale Teflon Valves

Hard Sought Valve, Count on Zhengmao

Zhengmao Valve Co., Ltd., established in 1992, focuses on the R&D and manufacturing of industrial valves, including ball valve, gate valve, globe valve, check valve, butterfly valve, discharge valve and filters. Our products are widely applied in petrochemical, power, water supply, gas, and other industrial systems, supported by integrated production facilities and a complete quality control process. With strong technical capability and stable manufacturing capacity, we provide reliable solutions for global procurement partners.

Teflon-Lined Butterfly Valve
Design and Manufacturing: GB 12238 (Midline) Structure length: GB12221 (short series) Flange size: JB78/JB79 (or as specified in the contract) Pressure test: GB/T 13937 Mark: GB12220 Supply:...
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Teflon-Lined Butterfly Valve
Design and Manufacturing: GB 12238 (Midline) Structure length: GB12221 (short series) Flange size: JB78/JB79 (or as specified in the contract) Pressure test: GB/T 13937 Mark: GB12220 Supply:...
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Teflon-Lined Butterfly Valve
Design and Manufacturing: GB 12238 (Midline) Structure length: GB12221 (short series) Flange size: JB78/JB79 (or as specified in the contract) Pressure test: GB/T 13937 Mark: GB12220 Supply:...
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Teflon-Lined Check Valve
① Main material: cast iron with PTFE lining, carbon steel with PTFE lining
② Nominal diameter: DN40 to DN400
③ Pressure range: 0.6MPa~4.0MPa
④...
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Teflon-Lined Globe Valve
① Main material: cast iron with PTFE lining, carbon steel with PTFE lining
② Nominal diameter: DN15 to DN400
③ Pressure range: 1.0MPa~4.0MPa
④ Operating...
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Teflon-Lined Diaphragm Valve
① Main material: cast iron with PTFE lining, carbon steel with PTFE lining ② Nominal diameter: DN40 to DN400 ③ Pressure range: 0.6MPa~4.0MPa ④ Operating temperature: -29℃~+150℃ ⑤ Drive modes:...
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Teflon-Lined Diaphragm Valve
① Main material: cast iron with PTFE lining, carbon steel with PTFE lining
② Nominal diameter: DN40 to DN400
③ Pressure range: 0.6MPa~4.0MPa
④ Operating temperature:...
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GB Teflon-Lined Ball Valve
① Main material: cast iron with PTFE lining, carbon steel with PTFE lining
② Nominal diameter: DN15 to DN400
③ Pressure range: 0.6MPa~4.0MPa
④...
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Teflon-Lined Diaphragm Valve
① Main material: cast iron with PTFE lining, carbon steel with PTFE lining
② Nominal diameter: DN40 to DN400
③ Pressure range: 0.6MPa~4.0MPa
④ Operating temperature:...
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Teflon-Lined Butterfly Valve
Design and Manufacturing: GB 12238 (Midline)
Structure length: GB12221 (short series)
Flange size: JB78/JB79 (or as specified in the contract)
Pressure test: GB/T...
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Teflon-Lined Check Valve
① Main material: cast iron with PTFE lining, carbon steel with PTFE lining
② Nominal diameter: DN40 to DN400
③ Pressure range: 0.6MPa~4.0MPa
④...
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Teflon-Lined Globe Valve
① Main material: cast iron with PTFE lining, carbon steel with PTFE lining
② Nominal diameter: DN15 to DN400
③ Pressure range: 1.0MPa~4.0MPa
④ Operating...
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Why Choose Us?

Rich Experience

With over three decades of manufacturing experience and 78,600 m² of production area, we operate a full process line supported by our own precision casting base to ensure stable output and consistent quality.

Professional Team

Our workforce includes 510 employees, with 54 senior engineers and 136 technical specialists, enabling efficient product development and reliable engineering support for diverse project needs.

Advanced Equipment

We operate a dedicated testing and inspection center equipped for pressure, low-temperature, high-temperature, leakage, and material performance tests, helping ensure each valve meets required performance standards.

Complete Qualifications

The company is certified under ISO9001:2015 and holds the TS A1 license for pressure pipeline equipment, providing buyers with confidence in compliance and quality management.

Specifications of Discharge Valve

Valve Type	Single-seat, upward-opening type or downward-opening type
Connection	Flanged, Threaded, Socket-Weld, Butt-Weld
Nominal Size	DN 25 – DN 300 (1″ – 12″) typical range
Pressure Rating	PN 10 – PN 250 depending on design and material grade
Body Material	Carbon steel, Stainless steel, Duplex / Alloy steel, or other special alloys (on request)
Actuation Mode	Manual (hand-wheel / handle), Pneumatic actuator, Electric actuator, Hydraulic actuator - optional per requirement
Discharge Direction	Upward-opening or downward-opening disc design (depending on tank/reactor / installation requirement)
Tightness / Residue Elimination	Compact structure, minimal dead volume, designed for full discharge without residual material left inside valve body
Applicable Media / Industries	Chemicals, petrochemicals, pharmaceuticals, food & beverage (hygienic version), storage tanks, reactors, viscous liquids, corrosive media, etc.
Surface Finish / Internal Roughness (for hygienic valves)	E.g. Ra ≤ 0.8 µm (or as per customer requirement) - for food / pharma / beverage applications (if applicable)

Common Troubleshooting Techniques for Teflon_lined Valves

Leakage

If you notice leakage from your discharge valve, first check for loose connections or damaged seals. Tighten any loose connections or replace worn-out seals as necessary. If the issue persists, contact Weidouli Valves' technical support team for guidance on the specific issue you are facing.

Insufficient Flow

In case of poor or insufficient flow, examine the valve system for any blockages or obstructions that may be hindering the fluid flow. Clean or remove any clogs carefully to restore the desired flow rate. If the problem persists, consult Weidouli Valves' experts for further assistance.

Valve Sticking

Occasionally, discharge valves may encounter sticking or jamming issues, affecting their smooth operation. In such cases, carefully inspect the valve for debris or foreign particles that may be hindering its movement. Clean and lubricate the valve components as per the Weidouli Valves' guidelines.

Our Certificates

Packing & Shipping

Packaging:	Wooden Cases, Cartons, Palletization.
Shipping:	By logistics; by shipping; by air.

productcate-1237-317

productcate-1299-590

FAQ

Q: What is the function of the discharge valve?

A: A discharge valve plays a crucial role in various industries. It is mainly used to control the release of fluids or gasses in industrial processes. The specific design of this valve allows for precision flow control in multiple applications.

Q: Can the valve fully discharge tank contents without leaving residue?

A: Yes. Our discharge valves are designed with minimal dead volume and compact structure; downward‑opening or upward‑opening designs help ensure near‑complete emptying of tanks or reactors, reducing risk of material retention.

Q: What materials and sealing options do you provide?

A: Body materials include carbon steel, stainless steel (304 / 316 / CF8 / CF8M), duplex/alloy steel, or special alloys if requested. Seal/seat materials and sealing design can be tailored: PTFE/PFA or corrosion‑resistant materials for chemical service; metal‑seated versions available for high‑temperature or corrosive media.

Q: What is the maintenance of discharge valve?

A: Regular inspection: Air release valves should be inspected regularly for any signs of damage or wear and tear. This includes checking the body of the valve for cracks, the float for any signs of deformation, and the sealing components for any damage.

Q: What actuation modes are supported?

A: We support manual operation (handle or hand‑wheel), as well as automated actuation - pneumatic, electric, or hydraulic - depending on customer's process requirements and automation level.

We're known as one of the most professional teflon valves manufacturers and suppliers in China. With over 30 years' experience, we warmly welcome you to wholesale high quality teflon valves made in China here from our factory. Contact us for more details.