MTV Series Modular Throttle Valves

Overview

The MTV Series is a compact, modular stackable throttle valve designed for precise flow control in hydraulic systems. This sandwich-type valve features a manually adjustable flow restriction mechanism, allowing operators to regulate actuator speed by controlling the volume of hydraulic fluid passing through the circuit. Built to NG6/Cetop 3 mounting standards, the MTV valve integrates seamlessly into modular valve stacks without requiring additional piping or fittings.

Key Functions

Working Principle

The MTV valve operates on the principle of variable orifice control:

• Adjustment Mechanism: Rotating the knurled knob moves an internal needle or spool, progressively opening or closing the flow passage

• Flow Restriction: The reduced cross-sectional area creates a pressure drop, limiting the volume of oil reaching the actuator

• Bi-Directional Operation: Throttling action occurs in both flow directions, making it suitable for circuits requiring controlled movement in extend and retract strokes

• Locking Feature: Once adjusted, the knob can be locked to prevent unintended setting changes from vibration or operator interference

Primary Applications

1. Machine Tool Hydraulics

• Regulates feed rates on milling machine tables and lathe carriages

• Controls rapid traverse versus working feed speeds in CNC machining centers

• Provides smooth acceleration and deceleration for precision positioning

2. Injection Molding Equipment

• Manages clamping unit closing speeds to prevent mold damage

• Controls ejector plate return speeds for gentle part removal

• Regulates core puller movements in complex mold designs

3. Material Handling & Conveying Systems

• Adjusts lifting and lowering speeds of hydraulic elevators

• Controls conveyor belt tensioning cylinder movements

• Regulates pallet changer speeds in automated storage systems

4. Agricultural & Construction Machinery

• Manages hydraulic cylinder speeds on harvester headers

• Controls implement lift/lower rates on tractors and loaders

• Regulates boom and arm movements in compact excavators

5. Press & Forming Equipment

• Controls pressing ram approach and return speeds

• Manages dwell timing through restricted flow during hold cycles

• Regulates stripper plate movements in stamping presses

Detailed Usage Scenarios

Scenario A: Dual-Speed Feed Circuit (Meter-In Control)

Configuration: MTV valve installed between pump and directional valve
Application: Hydraulic milling machine feed system
Operation:
- Full pump flow passes through MTV when fully open → Rapid traverse
- MTV partially closed by operator → Reduced flow → Controlled cutting feed
Benefit: Single pump provides both fast positioning and precise machining speeds

Scenario B: Cylinder Speed Matching

Configuration: MTV valve on cylinder rod port (meter-out control)
Application: Synchronization of two hydraulic cylinders driving a wide press platen
Function: Individual MTV adjustments balance flow to each cylinder, ensuring parallel movement
Advantage: Eliminates mechanical binding from uneven cylinder extension

Scenario C: Motion Damping

Configuration: MTV valve in parallel with check valve (throttle-check combination)
Application: Hydraulic elevator or lift platform
Operation:
- Check valve bypasses MTV during lifting → Full speed ascent
- MTV restricts flow during descent → Controlled, safe lowering speed
Result: Gravity-assisted return stroke with operator-adjustable safety limit

Scenario D: System Pressure Stabilization

Configuration: MTV valve in pilot line of pressure control valve
Application: Soft start circuits for large hydraulic pumps
Function: Restricted pilot flow delays main valve opening, preventing pressure spikes
Benefit: Protects system components from water hammer effects during startup

Technical Advantages

Installation & Adjustment Guidelines

Mounting Orientation

• May be installed in any position; horizontal mounting preferred for easy knob access

• Ensure valve port alignment with adjacent stack components (P, T, A, B ports)

Flow Direction Considerations

• Meter-In Control: Mount between pump and directional valve to control incoming flow

• Meter-Out Control: Mount between directional valve and actuator to control exhaust flow (preferred for load-holding applications)

Adjustment Procedure

1. Start with knob fully counter-clockwise (maximum flow)

2. Gradually rotate clockwise while monitoring actuator speed

3. Lock setting when desired speed is achieved

4. Mark position for future reference if repeatable settings are required

Maintenance

• Periodic cleaning of adjustment mechanism prevents binding

• Internal filter screens (if equipped) should be inspected annually

Model Designation Reference

The MTV Series represents an economical, reliable solution for applications requiring manual speed control without the complexity and cost of electro-proportional valves. Its robust construction and straightforward operation make it the preferred choice for equipment builders and maintenance engineers worldwide.