Brass Internal Thread Pressure Reducing Valve

The brass internal thread pressure reducing valve, with its core competitiveness of "durable brass material + convenient internal thread + precise diaphragm pressure stabilization", serves as the "pressure butler" for small and medium-flow low-pressure fluid systems. Compact in structure, cost-effective, and highly adaptable, it is widely used in fire protection, HVAC, civil, and light industrial applications, providing users with stable and reliable fluid pressure control solutions. Through proper selection and standardized installation, it can significantly extend the service life of downstream equipment, reduce energy consumption, and enhance system operational safety and economic efficiency.

● Valve Body/Bonnet：Brass
● Pressure Resistance：Shell test pressure 3.0MPa (no rupture after holding pressure for 5min)
● Sealing Test：1.1 times the maximum inlet pressure (no leakage after holding pressure for 3min)
● Salt Spray Test：Neutral salt spray (NSS) ≥240h (no rust on appearance)
● Medium Type：Clear water/Compressed air/Nitrogen/Inert gas
● OEM Service：Accepted
● Delivery Terms：FOB, CFR, CIF, EXW
● Payment Mode：T/T, L/C, PayPal, Western Union

Product category:

Pressure reducing valve

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Product Details

Product Formation

The brass internal thread pressure reducing valve is a fluid control component that utilizes an internal pressure feedback mechanism to steadily reduce high-pressure fluids (such as water, compressed air, inert gases, etc.) from the inlet to a preset low pressure at the outlet while dynamically maintaining a constant outlet pressure. Its core function is to achieve "pressure reduction and stabilization," making it widely applicable in fluid systems requiring precise downstream pressure control (e.g., firefighting, HVAC, industrial water supply and drainage, and civil equipment). With brass as the primary material and featuring internal thread connections, the product combines corrosion resistance, ease of installation, and long-term reliability, making it an ideal choice for regulating low-pressure fluids with small to medium flow rates.

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Other Classifed Products：

Fire Hose Categories, Fire Sprinkler System, Fire Protection Valve , Fire Hose Reel&Cabinet , Fire Foam Equipment，Fire Nozzle and Fire Monitor , Fire Hydrant , UL/FM Fire Fighting Equipment , Brass Valve Categories , Fire Extinguisher Series .

Product Features

Core material: The main body is made of brass. The copper element endows it with natural corrosion resistance (resistant to water, air, and weak acid-base erosion), which is better than carbon steel (prone to rusting), ensuring it is not easy to clog or leak during long-term use.
Mechanical properties: It has moderate strength and good ductility, and can be processed into complex structures (such as internal threads and valve disc mating surfaces) through casting/forging to ensure tightness.
Cost-effectiveness: Compared with stainless steel, the cost of brass is reduced by 30% to 50%, balancing performance and economy, making it suitable for civil and light industry scenarios.
Easy operation: No welding or flanges are required. Zero-leakage connection can be achieved with raw material tape or sealant, and installation can be completed by a single person (such as household water inlet pipes and fire-fighting branch pipes).
Clear direction: The valve body is marked with a flow direction arrow, and it should be installed according to "inlet → outlet" to avoid failure due to reverse connection.
Independent wearing parts: Core components such as diaphragms, springs, and valve discs are modularly designed. They can be replaced individually after wear (without disassembling the entire machine), reducing maintenance costs.
Long maintenance cycle: Under normal working conditions, check the elasticity of the diaphragm and spring rust every 6 months, and clean the inlet filter (100-mesh filter screen to prevent clogging) every year, resulting in low maintenance workload.
Universal accessories: Accessories of the same series with the same diameter (such as DN15/DN20) have a high universality rate, making procurement convenient.
Medium compatibility: It is suitable for clean water, compressed air, nitrogen, and inert gases (prohibited for steam, strong acids, and strong alkalis). It can be adapted to different media by replacing the diaphragm material (NBR is oil/water resistant, FKM is high-temperature resistant).

Product Parameter

Parameter Item	Specification/Description
Inlet Pressure (P₁)	0.5~2.5 MPa (The minimum inlet pressure shall be ≥ Outlet Pressure + 0.1MPa, i.e., the minimum pressure difference ΔP ≥ 0.1MPa)
Outlet Pressure (P₂)	Adjustable range: 0.05~0.8 MPa (conventional model); High - pressure model (specially designed): 0.1~1.6 MPa
Pressure Regulation Method	Top adjustment screw (pressurize when turning clockwise, depressurize when turning counterclockwise), scale mark reference values (such as 0.1/0.2/0.3/0.5MPa)
Medium Type	Clear water/Compressed air/Nitrogen/Inert gas
Prohibited Medium	Steam (>100°C), Strong acid (pH < 3), Strong alkali (pH > 11), Fuel oil, Liquid containing particles
Valve Body/Bonnet	Brass
Pressure Resistance	Shell test pressure 3.0MPa (no rupture after holding pressure for 5min)
Sealing Test	1.1 times the maximum inlet pressure (no leakage after holding pressure for 3min)
Salt Spray Test	Neutral salt spray (NSS) ≥240h (no rust on appearance)

FAQ

Q: Can you accept sample order?

A: Yes, we accept samples with little and reasonable charge.But need customer pay sample fees and transport fees first.

Q: What is your payment terms?
A: Payment supports T/T, L/C, etc.

Q: How can l get my order?
A: We will send you the goods by UPS,DHL,FedEx,Oversea Shipment or other forwarder, all with tracking number.

Q: Why choose us?
A： With over 15 years of experience in the fire protection industry, our company has professional technical personnel and many well-known partners in the domestic market. We offer favorable prices and guarantee quality, having passed multiple certifications!

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With more than 15 years of experience serving clients, we have developed extensive expertise and in-depth industry knowledge, enabling us to deliver reliable and effective solutions tailored to your requirements.
We provide professional technical support and customized service offerings. Our committed technical team is available to assist you with product consultation, installation guidance, and comprehensive after-sales support whenever necessary.
At Sheng Feng Fire, our professionals are dedicated to helping you select the most suitable products based on your specific needs.
Please do not hesitate to contact us for further information!