Check valves

Product catalog summary

Overview

This technical document from CBF s.r.l. provides comprehensive information on hydraulic check valves and pilot-operated valves, covering types, operating principles, technical specifications, product variants, and installation guidelines.

1. Valve Types and Operating Principles

Check Valves (Unidirectional Valves): Allow flow in one direction, sealed by either a ball or a guided conical shutter.
Hydraulically Unlocked Check Valves: Open via pilot pressure; pilot ratio selection is critical to enable unlocking as internal pressure increases.
Pilot Operated Check Valves: Include pilot-to-open and pilot-to-close types, controlling flow by seating or unseating the ball or conical shutter.
Other Valve Types: Includes three-way spool selector valves, parachute valves, load control valves, selector valves, ball and poppet valves, inline check valves, bidirectional valves, and various pilot-operated valve variants.

2. Technical Specifications and Operating Parameters

Pilot Pressure (Ppil): Pressure applied to actuate valves.
Total Pressure (Ptot): Pressure inside the valve element affecting operation.
Pilot Ratio: Essential for correct unlocking/locking behavior; typical ratios range from 1.9:1 to 11:1 depending on valve model.
Opening Pressures: Common opening pressures include 0.5 bar (7 psi), 1 bar (14 psi), 3 bar (43 psi), 5 bar (72 psi), up to 12 bar (170 psi) for some bidirectional valves.
Maximum Flow Rates and Pressure Ratings: Vary by model, covering typical hydraulic system requirements; specific values are detailed per valve type.
Viscosity and Filtration: Recommended fluid viscosities and absolute filtration levels are specified to ensure optimal valve performance and longevity.
Operating Temperature Range: Indicated but not explicitly detailed; users should verify for specific applications.
Tightening Torque: Installation torque recommendations provided, e.g., 2-4 Nm for parachute valves.

3. Valve Models and Variants

Cartridge and Insert Valves: Multiple models with varying opening pressures and flow capacities.
Pilot Operated Valves: Single and double effect versions, with aluminum or steel bodies, some with O-ring piston seals.
Selector and Parachute Valves: Designed for specialized hydraulic circuit functions, factory-set after assembly.
Bidirectional Valves: Steel body construction with higher opening pressures.
Inline and Separate Pilot-Operated Valves: Including flange versions and models with pilot ratios up to 11:1.

4. Materials and Construction

Valve bodies are constructed from aluminum or steel depending on model and application requirements.
Sealing options include O-rings on pistons or versions without O-rings, influencing valve sealing and maintenance.

5. Installation and Usage Recommendations

Data provided are indicative and non-binding; verification in specific applications is essential.
Proper selection of pilot pressure and pilot ratio is critical for valve functionality.
Adherence to recommended fluid viscosity and filtration levels is necessary to maintain valve performance and durability.
Valves are factory-set or regulated post-assembly to ensure correct operation.

6. Ordering and Accessories

Ordering codes are available for many valve models, especially pilot-operated types.
Accessories such as nipple screws can be requested to suit installation needs.

7. Manufacturer Contact Information

CBF s.r.l.
Via Caboto, 3 - 36075 Montecchio Maggiore (VI), Italy
Phone: +39 0444 499141 / 0444 499143
Fax: +39 0444 499145
Email: [email protected]
Website: www.cbfhydraulic.com

Summary

This document serves as a detailed technical reference for selecting and applying hydraulic check valves and pilot-operated valves from CBF s.r.l. It emphasizes critical parameters such as pilot pressure ratios, opening pressures, flow and pressure ratings, and installation conditions including viscosity and filtration. The comprehensive product range and technical data support informed decision-making for hydraulic system design and maintenance.

Catalog excerpts

hydraulic Valvole di blocco e di non ritorno Check valves

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CBF s.r.l. - Via Caboto, 3 - 36075 Montecchio Maggiore (VI) Tel. 0444 499141 / 0444 499143 - Fax 0444 499145 e-mail: [email protected] - http://www.cbfhydraulic.com 9$/92/(',1215,72512 &+(&.9$/9(6 Valvole unidirezionali: &RQVHQWRQRLOÀXVVRFRQOLPLWDWDSHUGLWD Check valves: 7KH\ DOORZ IUHH ÀRZ ZLWK OLPLWHG SUHVVXUH GURS LQ GLFDULFRLQXQDGLUH]LRQHHEORFFDQRLOÀXVVRLQVHQVRLQYHUVR RQHGLUHFWLRQDQGEORFNWKHÀRZLQWKHRSSRVLWHGLUHFWLRQ7KH\FDQ Possono avere la tenuta a sfera oppure mediante otturatore EHEDOORUJXLGHGSRSSHWW\SH conico guidato. Valvole unidirezionali a sbloccaggio oleodinamico: &RQVHQWRQRLOÀXVVRFRQOLPLWDWDSHUGLWDGLFDULFRLQXQDGLUH]LRQH...

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CBF s.r.l. - Via Caboto, 3 - 36075 Montecchio Maggiore (VI) Tel. 0444 499141 / 0444 499143 - Fax 0444 499145 e-mail: [email protected] - http://www.cbfhydraulic.com hydraulic* INDICE PER TIPO Dl VALVOLA INDEXBY VALVE TYPE Valvola unidirezionale ad inserto Check valve insert Valvola unidirezionale pilotata in apertura, a cartuccia Pilot to open operated check valve - cartridge type

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CBF s.r.l. - Via Caboto, 3 - 36075 Montecchio Maggiore (VI) Tel. 0444 499141 / 0444 499143 - Fax 0444 499145 e-mail: [email protected] - http://www.cbfhydraulic.com hydraulic INDICE PER TIPO Dl VALVOLA INDEX BY VALVE TYPE

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CBF s.r.l. - Via Caboto, 3 - 36075 Montecchio Maggiore (VI) Tel. 0444 499141 / 0444 499143 - Fax 0444 499145 e-mail: [email protected] - http://www.cbfhydraulic.com hydraulic Valvola unidirezionale a cartuccia Check valve - cartridge type Portata massima Dati e tarature ottenuti usando olio con viscosita 30 cSt a 50°C Performaces and calibrations are carried out by using hydraulic oil with 30 cStviscosity at 50°C Sigla di ordinazione / Ordering code

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