Pump DN15 Chemical Dosage Relief Valve High-Quality Safety Back Pressure Valve

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Pump DN15 Chemical Dosage Relief Valve High-Quality Safety Back Pressure Valve

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Product Description

Basic Information

Model NO.

186

Temperature

Ordinary Temperature

Connection

Welding / Threaded / Flange

Pressure

Adjustable

Material

PVC / UPVC / PP / CPVC / PVDF

Nominal Diameter

DN15

Filter Material

UPVC, PP, CPVC, PVDF

Diaphragm

PTFE + Rubber Composite

Product Description

🛡️ Safety Valve

The diaphragm and valve core are compressed by an internal spring. When pressure exceeds the preset value, they lift, allowing discharge into the return pipe. Adjust pressure on-site within 0-1.0 MPa using the screw and pressure gauge. Relief pressure is set 0.1-0.2 MPa above system pressure.

🔄 Back Pressure Valve

Installed on positive discharge lines to prevent siphoning and ensure dosing accuracy. Adjust backpressure on-site within 0-0.6 MPa. Benefits include:

Releases pressure for system stability
Protects pump and maintains operation
Minimizes water hammer and controls vibration
Advanced PTFE+rubber diaphragm for zero-leakage sealing

Technical Specifications

Model	Size	L (mm)	H (mm)	D (mm)	d (mm)	z	h (mm)
18615	DN15	166	165	82	20	18	25
18620	DN20	170	165	82	25	21	25
18625	DN25	212	173	107	32	26	35
18632	DN32	226	173	107	40	28	35
18640	DN40	292	225	148	50	37	58
18650	DN50	305	225	148	63	37	58

Operation & Adjustment

⚙️ How to adjust the back pressure valve?

1. Never exceed the maximum working pressure of the metering pump.
2. Discharge end pressure should be at least 1 bar higher than suction end pressure when suction pressure exists.

⚙️ How to set the safety valve pressure?

Adjust within the rated range. Generally, set 1-2 bar higher than the back pressure valve to prevent overpressure operation.

Packaging & After Sales

Standard Warranty: 12 months or 2,000 operating hours.
Global Support: 24/7 technical assistance and spare parts supply.
Training: On-site or remote operation/maintenance training available.

Quality Certifications

Frequently Asked Questions

Q: What is the typical lead time for orders?

A: Standard models are usually shipped within 15–30 days. For customized units or large bulk orders, the lead time is approximately 30–45 days.

Q: What materials are available for corrosive chemicals?

A: We offer a variety of chemically resistant materials including UPVC, PP, CPVC, and PVDF to ensure compatibility with different industrial fluids.

Q: Do you provide export documentation?

A: Yes, we provide a complete export package including Commercial Invoice, Packing List, Bill of Lading, and Certificate of Conformity (COC).

Q: Can the back pressure be adjusted after installation?

A: Yes, the pressure can be adjusted on-site within its rated range (e.g., 0-0.6 MPa) using the adjustment screw and a pressure gauge.

Q: What is the benefit of the PTFE composite diaphragm?

A: The PTFE+Rubber composite diaphragm provides excellent chemical resistance combined with the flexibility of rubber, ensuring a superior seal and longer service life.

Q: Is overseas technical support available?

A: Yes, we offer 24/7 remote technical assistance and have partnered service centers in key global regions to support your maintenance needs.