I. Explanation of Model Number

D632: D632 series two-stage nozzle flap proportional valve (high pressure, large flow)

108: Flow code 10 = 38 L/min (Δp = 10 bar); 8 = internal pilot + standard leakage + highly stable / anti-vibration valve core

B: Form A25 installation surface + NBR (nitrile rubber) seal (-20 to +95℃)

Sentence: D632-108B = 38L/min high flow + internal pilot without Y port + A25 large installation surface + NBR standard seal + standard leakage + highly stable anti-vibration + 280bar high pressure proportional valve

II. Core Parameters (Δp = 10 bar)

Rated flow: 38 L/min

Maximum pressure: 280 bar

Hysteresis: ≤ 4% (between 106B and 107B)

Resolution: ≤ 1%

Zero leakage: ≈ 1.8 L/min (70 bar) (same as 101B standard leakage)

Pilot method: internal pilot (without Y port, main oil circuit self-taken)

Sealing / Temperature: NBR (-20 to +95℃)

Coil: 28Ω, ±100mA, 0.14W

Filter: NAS 7 / ISO 4406 15/12

Features: Strong anti-vibration, good zero stability, small long-term drift

III. Positioning of D632-108B (101B/106B/107B/108B comparison) Table

Model Flow Rate Pre-先导 Leakage (70bar) Hysteresis Core Features

101B 38L/min Internal Pre-先导 ≈2.0 L/min ≤5% Basic model， standard leakage

106B 38L/min Internal Pre-先导 ≈0.8 L/min ≤5% Low leakage， energy-saving

107B 38L/min Internal Pre-先导 ≈0.5 L/min ≤3% Ultra-low leakage， high frequency response， top configuration

108B 38L/min Internal Pre-先导 ≈1.8 L/min ≤4% Standard leakage + high stability / anti-vibration

In one sentence： 108B is the "Stable Type" - with the same internal pre-先导 and flow rate as 101B， the leakage is close to that of 101B, but the anti-vibration / zero position stability has been significantly improved， suitable for working conditions with large vibration and high stability requirements.

Four. Application Scenarios (D632-108B)

High flow rate and high pressure + strong vibration environment： Metallurgical rolling mills， vibrating presses with large vibration， heavy construction machinery

Long-term continuous operation， high zero position stability requirements， small drift

No independent pre-先导 source， simplified oil circuit (without Y port)

Oil temperature ≤ 95℃， ordinary mineral hydraulic oil

A25 large installation surface， high flow rate， high pressure (≤ 280 bar) + anti-vibration + high stability

Not pursuing the ultimate low leakage， but reliable， durable， and low maintenance