Product Description

Pressure Reducing Valve Product Introduction & Technical Specifications

1. Product Introduction

A pressure reducing valve is an automatic control component that stably reduces high inlet fluid pressure to a low outlet pressure and automatically maintains constant outlet pressure. It is widely used in fluid systems to ensure equipment safety and stable process conditions.

Its core working principle is based on a pressure balance closed-loop: the outlet pressure is fed back to the regulating mechanism, achieving dynamic balance with spring force. The valve spool opening is adjusted to offset fluctuations in inlet pressure and flow, thus achieving stable pressure regulation.

2. Technical Specifications

 Nominal Diameter (DN): 15500mm, determines flow capacity and must match the pipeline size.

 Nominal Pressure (PN): 1.016.0MPa, the long-term working pressure limit, which must be greater than or equal to the system working pressure.

 Outlet Pressure Range: 0.0225MPa, covering common applications such as 0.20.8MPa (civil) and 0.41.6MPa (industrial).

 Pressure Deviation: 1%5%FS; pilot-operated types 1%, direct-acting types 10%.

 Flow Coefficient (Kv/Cv): 42700, positively correlated with the nominal diameter; DN200 corresponds to Kv 630.

 Working Temperature: -40+425; steam applications can reach 540 (with special materials).

 Shell Test Pressure: 1.52.4 times PN, used to verify pressure resistance and sealing (excluding diaphragms and valve covers).

 Applicable Media: Gas, liquid, steam, corrosive fluids, matched with material compatibility.

3. Main Component Materials

Valve Body / Bonnet

 304/316/316L Stainless Steel: General corrosion-resistant, preferred for food, pharmaceutical, and chemical industries.

 Brass (H62/H65): For low-pressure non-corrosive media, low cost and easy processing.

 Cast Steel (WCB): For high-pressure normal-temperature media, high strength.

 Cast Iron: Low-cost option for low-pressure water systems, requiring anti-corrosion coating.

Spool / Seat

 2Cr13 / Stainless Steel: Wear-resistant and corrosion-resistant, for general applications.

 Stellite Alloy: For steam / high-pressure washing scenarios, anti-wear performance.

 Ceramic: For highly erosive media, high hardness and long service life.

Diaphragm / Piston / Seal

 Rubber (NBR/EPDM): For general low-pressure conditions, temperature 120.

 PTFE (Polytetrafluoroethylene): Corrosion and high-temperature resistant, suitable for chemical / high-purity media.

 Stainless Steel / Special Alloys: For high-pressure / high-temperature scenarios, such as steam systems.

Spring

 Stainless Steel (304/316): Corrosion-resistant with stable elasticity.

4. Product Features

 Precise Pressure Regulation: Pilot-operated types control outlet pressure fluctuation within 1%, suitable for precision processes.

 Adaptive Regulation: Automatically compensates for inlet pressure / flow fluctuations to maintain constant set pressure.

 Safe and Reliable: Automatically relieves pressure or shuts off in case of overpressure, protecting equipment and personnel (e.g., dedicated gas valves).

 Wide Compatibility: Multiple material / structure options, covering gas, liquid, steam, and highly corrosive conditions.

 Easy Installation and Maintenance: Modular design with flexible flange / thread connections, and simple replacement of wearing parts.