VDRV7 - VDV7 06 ? 08

Product catalog summary

Overview: The document provides technical specifications and operational details for the Veljan Throttle Valves VDV7 and VDRV7 series, which are used for flow regulation in hydraulic systems without pressure compensation. These valves are suitable for applications where line pressure is steady, and minor flow variations due to pressure changes are acceptable.

Specifications:

Flow Rates: Nominal flow rates vary by size, with 3/8” & 1/2” valves at 25 gpm (95 lpm) and 3/4” & 1” valves at 50 gpm (190 lpm).
Adjustment: Manual adjustment with an operating torque of 300 N-cm at 210 bar (3000 psi). Adjustments should not be made under pressure beyond 210 bar.
Operating Pressure: Maximum operating pressure is 5000 psi (350 bar).
Temperature Range: Fluid temperature ranges from -18°C to +80°C (0°F to +176°F), and ambient temperature ranges from -20°C to +60°C (-4°F to +140°F).
Viscosity Range: Unlimited.

Design and Functionality:

Valve Type: Spool type valve with metering groove.
Mounting: Available in subplate or threaded body configurations.
Flow Direction: VDV7 allows metered flow in both directions, while VDRV7 allows metered flow in one direction and free flow in the reverse direction.
Cracking Pressure: Approximately 2 bar for VDRV7.

Performance Curves: The document includes performance curves illustrating pressure drop versus flow rate for different valve sizes and configurations, highlighting the operational characteristics under various pressures.

Ordering Information: The document provides detailed ordering codes for different configurations, including options for adjusting scales, mounting types, and connection threads.

Dimensions: Detailed dimensional drawings and measurements are provided for various valve sizes and configurations, ensuring proper installation and compatibility with existing systems.

Additional Notes: The document advises consulting for special working conditions and notes that product details are subject to change without prior notice.

Catalog excerpts

THROTTLE VALVE Series - VDRV7/VDV7 Veljan Throttle Valves VDV7 and Throttle Valves with integral Check Valves VDRV7 are for various applications requiring flow regulation without pressure compensation. In a circuit where the line pressure is almost steady and small function of oil flow due to pressure changes is permitted, the usage of this valve is ideally recommended. The integrated check valve allows reversed free flow from outlet port to inlet port. These va Ives are not intended for use as shut-off valves. For accurate control, pressure and temperature compensation is essential and for the same usage of Flow Control Valve Series V2F1 C is ideal. Contact VELJAN for further information. Port sizes Ambient temperature Special working Operating Pressure Range (inlet or outlet] Cracking pressure Leakage when Fully closed Throttle with integral check Valve VDRV7 Spool Type valve with metering groove Subplate / Threaded Threads in subplate / threads in body B.S.P.P.& NPTF threaded Consult VELJAN Nominal flow Fluid Temperature Viscosity range Operating Torque (adjustment should not be done under

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THROTTLE VALVE Series - VDRV7/VDV7 ORDERING CODE B.S.P.P. Threads (connections) — NPTF = Standard (code omitted] VDRV7 = Throttle valve with integral check valve Nominal size - - Special fluids (further information required] ordered seperately] 1 = Without adjusting scale 2 = With adjusting scale 3 = Subplate mounted (only for PERFORMANCE CURVES Flow qv Ipm (gpm) Flow qv Ipm (gpm) Flow qv Ipm (gpm) Throttle open Throttle closed Throttle open Throttle closed Throttle open Throttle closed

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THROTTLE VALVE VDRV7/VDV7 - Series Stroke Vs Flow characteristics

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THROTTLE VALVE VDRV7/VDV7 - Series THROTTLE VALVE WITH ADJUSTING SCALE

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THROTTLE VALVE VDRV7/VDV7 - Series THROTTLE VALVE WITHOUT ADJUSTING SCALE

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THROTTLE VALVE VDRV7/VDV7 - Series * Mounting screws are included in subplate order. For valves ordered without subplate, mounting screws must be ordered separately.

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