Editorial Technical Reference

Pressure Reducing Valve

This page explains how Pressure Reducing Valve is classified within Machinery and Equipment Manufacturing. Technical values and manufacturer relationships are research references; confirm the current specification and supplier evidence for each order.

Technical Definition & Core Assembly

A valve that automatically reduces a higher inlet pressure to a steady lower outlet pressure regardless of flow variations.

Representative product image. Confirm appearance and specifications with the manufacturer.

Product Specifications

Technical details and manufacturing context for Pressure Reducing Valve

Definition
A pressure reducing valve is a component used in steam distribution systems to maintain a consistent downstream pressure. It automatically throttles the flow of steam when the upstream pressure exceeds a set point, ensuring that steam-using equipment operates safely and efficiently. The valve operates on a simple mechanical principle: a diaphragm or piston senses the downstream pressure and modulates a spring-loaded main valve. When downstream pressure rises above the set point, the sensing element compresses the spring, partially closing the valve to reduce flow and pressure. Conversely, when pressure drops, the spring opens the valve to increase flow. This self-regulating action provides a steady outlet pressure despite variations in inlet pressure or flow demand. Typical materials for construction include stainless steel, cast iron, and bronze, with body material often specified as WCB (carbon steel) per ASTM A216. Standard seal material is EPDM, resistant to water and many chemicals, with high-temperature options available. The valve is available in nominal diameters from 15 to 100 mm, with an operating pressure range of 1.0 to 1.6 MPa. The outlet pressure is adjustable within 0.05 to 1.0 MPa, with a pressure accuracy of ±5% of the set outlet pressure. Flow capacity (Cv) ranges from 2.5 to 100, corresponding to the nominal diameter. Operating temperature range is -10 to 80°C for standard seals. Weight varies from 2.5 to 35 kg depending on size and pressure rating. When selecting a pressure reducing valve, verify model-specific values for pressure, temperature, and flow capacity with the manufacturer or supplier. Confirm that the valve's materials are compatible with the fluid and operating conditions. Check the standards referenced, such as for testing and pressure ratings. Regular maintenance includes inspecting for leaks, verifying set pressure, and checking for wear on seals and springs. Failure signs include unstable outlet pressure, excessive noise, or leakage. Always consult the manufacturer's documentation for installation, operation, and maintenance guidelines.
Working Principle
The valve uses a diaphragm or piston to sense downstream pressure. This sensing element acts against a spring-loaded main valve. When downstream pressure rises above the set point, the sensing element compresses the spring, causing the main valve to partially close, reducing flow and pressure. When pressure drops, the spring expands, opening the valve to increase flow. This feedback loop maintains a steady outlet pressure regardless of upstream pressure fluctuations or flow demand changes.
Common Materials
Stainless Steel, Cast Iron, Bronze
Technical Parameters
ParameterTypical rangeNotes & selection driver
Nominal Diameter15–100 mmStandard sizes for pipe connections
Outlet Pressure Range0.05–1.0 MPaAdjustable within this range
Flow Capacity (Cv)2.5–100 CvCorresponds to DN 15–100
Pressure Accuracy±5 %Of set outlet pressure
Operating Temperature-10–80 °CFor standard seals; high-temp options available
Seal MaterialEPDMResistant to water and many chemicals
Body MaterialWCBCarbon steel for general serviceASTM A216
Weight2.5–35 kgDepends on size and pressure rating

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM
  • Valve Body
    Main housing containing steam flow path and valve seat
    Material: Cast Iron or Stainless Steel
  • Diaphragm/Piston Part
    Senses downstream pressure changes to actuate valve movement
    Material: Stainless Steel or Rubber
  • Spring Part
    Provides counterforce to maintain set pressure
    Material: Spring Steel
  • Adjusting Screw Part
    Allows manual setting of outlet pressure
    Material: Stainless Steel
  • Valve Disc Part
    Sealing element that modulates steam flow
    Material: Stainless Steel

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Industrial Ecosystem & Supply Chain Structure

Complementary Systems
Downstream Applications
Specialized Tooling

Application Fit & Sizing Matrix

Operational Limits
pressure: Inlet: up to 25 bar (standard), 40 bar (high-pressure models); Outlet: adjustable typically 0.5-10 bar
flow rate: 0.5 to 100 m³/h depending on valve size and pressure drop
temperature: -20°C to 120°C (standard elastomers), up to 200°C with high-temp materials
slurry concentration: Not recommended for slurries >5% solids by weight; clean liquids preferred
Media Compatibility
✓ Potable water systems ✓ Steam distribution networks ✓ Compressed air lines
Unsuitable: Highly corrosive chemicals (e.g., concentrated acids, chlorinated solvents)
Sizing Data Required
  • Maximum inlet pressure (bar)
  • Required outlet pressure setpoint (bar)
  • Maximum expected flow rate (m³/h)

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Cavitation damage
Cause: Pressure drop across valve exceeds allowable differential pressure, causing vapor bubble formation and implosion that erodes valve trim and body surfaces
Sticking or binding of moving parts
Cause: Accumulation of debris, corrosion products, or mineral deposits in the valve body, particularly affecting the diaphragm, spring, and pilot system components
Maintenance Indicators
  • Audible chattering, whistling, or hammering sounds from the valve during operation
  • Visible external leakage at body-bonnet joints, stem packing, or downstream of the valve
Engineering Tips
  • Install strainers upstream and ensure proper filtration to prevent particulate ingress that causes wear and clogging
  • Implement regular pressure monitoring and adjust setpoints to maintain operation within manufacturer's recommended differential pressure limits

Indicative industry ranges for design and RFQ preparation. Confirm the exact figures and applicable standard with the manufacturer before specifying.

Compliance & Manufacturing Standards

Applicable Standards
ISO 4126-1: Safety valves - Part 1: General requirements ANSI/ASME B16.34: Valves - Flanged, Threaded, and Welding End DIN EN 1567: Building valves - Pressure reducing valves and combination pressure reducing valves - Requirements and tests

Quoted from the published standard.

Manufacturing Precision
  • Bore diameter: +/-0.05mm
  • Seat flatness: 0.02mm across sealing surface
Quality Inspection
  • Hydrostatic pressure test (1.5x rated pressure)
  • Leakage test at rated pressure with specified fluid

Manufacturers of Pressure Reducing Valve

8 companies list this product among what they make. Company figures are quoted from each company's own website; every card states where the relationship came from.

Shenzhen Jewellok Technology
Shenzhen, Guangdong, CN
Managed by the manufacturer
Listed on the company's own website
Hydraflu Hydraulic Co.
Shanghai, CN
CE
Listed on the company's own website · profile compiled by CNFX from public sources
Sunthai Extractor
Zhejiang, CN
200-500 staff20,000 m²
ISO 9001:2015
Listed on the company's own website · profile compiled by CNFX from public sources
Chinadrip Irrigation Equipment (Xiamen) Co., Ltd.
Xiamen, Fujian, CN
Listed on the company's own website · profile compiled by CNFX from public sources
Convista
Beijing, CN
Listed on the company's own website · profile compiled by CNFX from public sources
Donjoy Technology
Wenzhou, Zhejiang, CN
Listed on the company's own website · profile compiled by CNFX from public sources
GIM FLUID Equipment (Shanghai) Co., Ltd.
Shanghai, CN
Listed on the company's own website · profile compiled by CNFX from public sources
Hydrath Power
Zhejiang, CN
Listed on the company's own website · profile compiled by CNFX from public sources

Manufacturer listings support early research and capability understanding. They are not certification, ranking, or transaction guarantees.

Technical documentation
Request current drawings, revision history, and a signed specification sheet.
Manufacturing capability
Verify equipment lists, process limits, capacity, and representative production evidence.
Inspection readiness
Confirm test methods, calibrated equipment, sampling plans, and traceable reports.
Supplier transparency
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Frequently Asked Questions

What is the typical operating pressure range for this pressure reducing valve?

According to the directory data, the operating pressure range is 1.0 to 1.6 MPa. However, you must verify the exact range for your specific model and application with the manufacturer or supplier.

What materials are available for the valve body and seals?

The valve body can be made of stainless steel, cast iron, or bronze, with a common body material being WCB (carbon steel) per ASTM A216. The standard seal material is EPDM, which is resistant to water and many chemicals. High-temperature seal options may be available, but confirm with the manufacturer.

How does the valve maintain a steady outlet pressure?

The valve uses a diaphragm or piston to sense downstream pressure. This sensing element modulates a spring-loaded main valve. If downstream pressure rises above the set point, the valve partially closes; if it drops, the valve opens. This automatic adjustment maintains a steady outlet pressure despite flow variations.

What standards apply to this valve?

The nominal diameter and operating pressure are. The body material WCB is per ASTM A216. These standards are for verification and procurement reference; they do not guarantee certification or compliance of a specific product. Always check with the manufacturer for applicable standards and certifications.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification
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