SRVT Series Solenoid Operated Relief Valves & RVT Series Pilot Operated Relief Valves

Overview

The SRVT series is a high-performance pilot-operated solenoid relief valve engineered for compact installation and versatile system integration. This advanced valve combines a robust main-stage relief valve with a solenoid-operated pilot control system, offering the unique advantage of inline pipe mounting capability alongside traditional subplate installation options. The compact, cylindrical body configuration with threaded ports makes it ideal for space-constrained hydraulic systems, mobile equipment, and applications requiring direct pipeline integration without manifold mounting.

Key Features

• Pilot-Operated Two-Stage Architecture: Delivers stable, precise pressure regulation with minimal pressure override across wide flow ranges

• Threaded Cartridge/Inline Body Design: Cylindrical body with threaded ports (BSPT) enables direct pipe-to-pipe installation without subplate requirements

• Space-Efficient Construction: Compact vertical profile minimizes mounting footprint compared to traditional flanged relief valves

• Solenoid Actuation: Integrated electromagnetic pilot control allows remote electrical activation for unloading and pressure selection

• Manual Pressure Override: Independent manual adjuster for field calibration, emergency operation, and maximum pressure limiting

• Dual Installation Flexibility: Suitable for both inline pipe mounting and manifold/cartridge cavity installations

• Visual Status Indication: Transparent solenoid housing with LED indicator provides clear operational status feedback

• Durable Construction: High-strength body material with corrosion-resistant coating for extended service life in mobile and industrial environments

Primary Functions

1. Programmable Pressure Relief: Electrical activation enables remote, automated pressure control synchronized with machine cycles

2. System Unloading & Energy Management: Solenoid-controlled unloading reduces pump power consumption and heat generation during idle periods

3. Inline System Protection: Direct installation in main pressure lines provides immediate overpressure protection without additional manifold components

4. Safety Interlocking: Integration with safety PLCs and emergency stop circuits for fail-safe hydraulic system management

5. Bi-Functional Operation: Serves as both conventional relief valve (manual mode) and electrically controlled relief/unloading valve (solenoid mode)

Detailed Application Scenarios

Mobile & Off-Highway Equipment

• Compact Construction Machinery: Mini-excavators, skid-steer loaders, and compact track loaders where space constraints prevent traditional manifold mounting; the SRVT's inline design allows direct installation in pump-to-valve pressure lines

• Agricultural Tractors & Implements: Self-propelled sprayers, seeders, and tillage equipment requiring hydraulic pressure control in cramped engine compartments or frame structures

• Utility Vehicles & Telehandlers: Aerial work platforms, material handlers, and utility trucks where valve mounting space is limited and inline installation simplifies plumbing

• Forestry Equipment: Feller bunchers and delimbers operating in harsh environments where compact, robust hydraulic components are essential

Industrial Equipment with Space Constraints

• Packaging Machinery: Compact filling machines, sealing equipment, and cartoners where hydraulic power units must fit within confined machine frames

• Food Processing Equipment: Stainless steel-compatible versions for hydraulic drives in mixers, conveyors, and forming equipment with strict hygiene and space requirements

• Textile Machinery: Looms, spinning frames, and fabric processing equipment where compact hydraulic tensioning and positioning systems are required

• Printing & Converting: Web tension control systems and roll handling equipment in narrow production line configurations

Hydraulic Power Units & Compact Systems

• Portable Hydraulic Power Packs: Compact power units for maintenance tools, emergency rescue equipment, and mobile service applications

• Machine Tool Auxiliary Hydraulics: Secondary hydraulic circuits for clamping, coolant systems, and chip conveyors where space is at a premium

• Test & Calibration Equipment: Portable hydraulic test benches and field calibration units requiring compact, lightweight pressure control components

• OEM Integrated Systems: Custom machinery where the SRVT can be directly threaded into proprietary manifold blocks or cast housings

Marine & Offshore Applications

• Deck Machinery: Winches, capstans, and mooring equipment where inline installation simplifies piping in confined deck spaces

• Hydraulic Steering Systems: Compact pressure control for vessel steering gear with direct pump-line mounting capability

• Fishing Equipment: Net handling systems, trawl winches, and processing equipment on commercial fishing vessels

• Subsea Tooling: Surface-deployed hydraulic tools where compact, robust pressure control is required for ROV and diving support operations

Specialized Industrial Applications

• Injection Molding Auxiliary Units: Compact hydraulic circuits for core pull, ejector, and auxiliary functions separate from main machine hydraulics

• Die Casting Peripheral Equipment: Robotic extractors, sprue pickers, and cooling systems requiring compact pressure control

• Metalworking Coolant Systems: High-pressure coolant delivery systems for machining centers with inline pressure regulation

• Water Jet Cutting: Auxiliary pressure control circuits for abrasive handling and positioning systems

Technical Advantages

The SRVT series offers distinct advantages through its unique inline configuration:

• Installation Flexibility: Threaded ports allow direct connection to hydraulic piping without subplates, reducing installation cost and space requirements

• Compact Footprint: Vertical cylindrical design occupies minimal mounting area compared to traditional flanged relief valves

• Reduced Plumbing Complexity: Eliminates need for manifold blocks in simple systems; direct pump-to-tank or pump-to-valve installation possible

• Service Accessibility: Inline mounting often provides better field access for adjustment and maintenance compared to buried manifold installations

• Weight Reduction: Elimination of heavy mounting subplates reduces overall system weight—critical for mobile and aerospace applications

• System Modularity: Can be easily added to existing hydraulic circuits as upgrade or retrofit without manifold redesign

• Pilot-Operated Performance: Maintains all advantages of two-stage design—low override, stable pressure, high flow capacity—despite compact packaging

Installation & System Integration

• Inline Mounting: Direct threading into hydraulic lines using appropriate pipe fittings; ensure proper wrench flats engagement to prevent body damage

• Orientation: Typically mounted with solenoid upright for moisture protection; consult specifications for approved mounting orientations

• Port Configuration: Common configurations include in-line (P-T straight through) or 90-degree (side inlet/bottom outlet) arrangements

• Electrical Connection: DIN 43650 Form A connector standard; verify coil voltage and environmental protection rating (IP65/IP67 typical)

• Manual Adjustment Access: Ensure sufficient clearance for adjuster knob rotation during field calibration

• Support Requirements: Consider pipe support brackets for heavy or vibration-prone installations to prevent mechanical stress on valve body

Operational Modes

Standard Operation (Solenoid De-energized):

• Valve functions as conventional pilot-operated relief valve at manually set pressure

• Provides continuous system overpressure protection

Electrical Unloading (Solenoid Energized):

• Main stage opens fully, diverting pump flow to tank at minimal pressure

• Enables energy-saving pump unloading and system idle mode

Fail-Safe Configurations:

• Normally Closed: Relieves at set pressure when de-energized; unloads when energized (safety default)

• Normally Open: Unloads when de-energized; requires energization to build system pressure (special order)