Pilot Operated Relief Valves BG BT
更新時間：2026-08-21 15:34:18??
BG & BT Series Pilot Operated Relief Valves
Quick Takeaway: BG=base-mounted (G=Mounting), BT=threaded (T=Thread) . Both are Yuken/CML standard pilot-operated relief valves with identical performance—only the connection method differs.
1. Core Difference: Mounting Method
|
Model
|
Mounting Type
|
Description
|
|
BG Series
|
Base/Flange Mounted
|
Installed via dedicated mounting plate (standard hydraulic interface)
|
|
BT Series
|
Threaded Connection
|
Directly threaded into hydraulic circuit (T=Thread)
|
2. Shared Performance & Features
Key Specifications (Typical Yuken/CML)
-
Max operating pressure: 25 MPa (3,630 psi)
-
Max flow rate: Up to 400 L/min (106 gpm)
-
Pressure adjustment range: 0.5-25 MPa (varies by model)
-
Body material: Cast iron or ductile iron
-
Seals: Nitrile rubber (standard), Viton (optional)
Functional Advantages
-
Pilot-operated design: Small pilot valve controls large main valve for stable pressure regulation and low noise
-
Remote control capability: Vent circuit enables remote pressure adjustment and system unloading
-
Shock mitigation: Gradual pressure reduction during unloading prevents system shock
-
High flow handling: Efficiently manages large flow rates with minimal pressure fluctuation
3. Working Principle
-
System pressure acts on both pilot valve and main valve via damping orifice
-
When pressure reaches pilot valve setting, pilot valve opens, creating flow through damping orifice
-
Pressure difference across main valve overcomes main spring force, opening main valve for large-flow relief
-
Main valve closes when system pressure drops below set point
4. Model Number Breakdown (Example: BT-03-P-V-32)
|
Segment
|
Meaning
|
Options
|
|
BT/BG
|
Series (BT=threaded, BG=base)
|
BT, BG
|
|
03/06/10
|
Valve size (nominal flow capacity)
|
03 (small), 06 (medium), 10 (large)
|
|
P/H/C
|
Plunger type
|
P=standard, H=high response, C=custom
|
|
V
|
Seal material
|
V=NBR (standard), other letters for special materials
|
|
32
|
Pressure range code
|
32=0.5-25 MPa
|
5. Applications
-
Hydraulic system protection: Prevent overpressure damage to pumps, valves, and actuators
-
Pressure regulation: Maintain constant pressure in hydraulic circuits
-
Unloading function: Enable pump unloading via remote control for energy savings
-
Remote pressure control: Adjust system pressure from a distance using auxiliary pilot valves
-
Common industries: Construction machinery, industrial presses, plastic injection molding, machine tools, agricultural equipment
6. Selection Guide
Choose BG if:
-
You need rigid, leak-free installation for high-vibration environments
-
Multiple valves need to be mounted on a common manifold
-
System requires easy maintenance and valve replacement
Choose BT if:
-
Space is limited and a compact installation is needed
-
You prefer simpler, direct connection without mounting plates
-
Lower installation cost is a priority
7. Maintenance Tips
-
Regularly check for leaks at connections (BG: mounting surface; BT: thread seal)
-
Clean or replace filter elements to prevent contamination damage
-
Periodically verify pressure setting accuracy with a calibrated pressure gauge
-
Use only manufacturer-recommended seal materials for compatibility
-
Follow proper torque specifications for BG mounting bolts or BT thread connections
