Product Overview

The Y43H/Y13H Pilot Piston Type Steam Pressure Reducing Valve is a high-performance pressure regulation device that automatically reduces higher inlet pressure to a stable lower outlet pressure. Featuring a pilot-controlled piston design, it is widely used for pressure control in steam systems.

Key Features

• Precise Pressure Control– Pilot-operated system ensures accurate regulation and stable outlet pressure
• Piston Actuator– Superior to diaphragm designs with higher pressure capacity and longer service life
• High Flow Capacity– Optimized flow path design provides large flow capacity with minimal pressure drop
• Self-Regulating– Automatically adjusts to maintain set pressure despite flow variations
• Low Noise Operation– Special pressure reduction structure minimizes operational noise
• Easy Maintenance– Modular design allows replacement of key components

Technical Specifications

Working Principle

The Y43H/Y13H valve features a pilot-controlled main valve design. When the adjusting spring is in free state, both main valve and pilot valve remain closed. Rotating the adjusting screw clockwise compresses the spring, opening the pilot valve. Medium then flows through the pilot valve to the upper chamber of the main valve piston, pushing it downward to open the main valve. Medium flows to the outlet while also entering below the diaphragm. When outlet pressure exceeds the set value, feedback action reduces pilot valve opening, thereby controlling the main valve piston position to maintain stable outlet pressure.

Structural Features

• Pilot Control– Small pilot valve controls main valve operation with high sensitivity
• Piston Actuator– Provides strong thrust for high differential pressure applications
• Pressure Balanced Design– Minimizes medium force impact on regulation accuracy
• Double Sealing Structure– Ensures tight closure with zero leakage
• Online Maintenance– Wear parts can be replaced without valve body disassembly

Applications

• Power plant boiler steam systems
• Petrochemical plants
• Pharmaceutical and food processing equipment
• Textile dyeing machinery
• HVAC systems
• Industrial steam distribution pipelines

Model Selection Guide

Installation & Maintenance

Installation Requirements

• Install horizontally with valve arrow matching medium flow direction
• Install a strainer upstream to prevent seat damage from impurities
• Maintain 10×pipe diameter straight run downstream
• Install safety valve downstream as overpressure protection

Maintenance

• Regularly check if outlet pressure matches set value
• Inspect sealing performance every 6 months
• Perform comprehensive maintenance annually
• Shut down immediately if abnormal noise or vibration occurs