Pressure Relief Valves. SPV, SPVF direct operated

Transcription

1 Pressure Relief Valves SPV, SPVF direct operated

2 Construction P Ø d 1 a T c 2 3 b 4 1 Housing 2 Sliding piston 3 Compression spring 4 Set screw Bleeding screw 6 Protective cap 6 Description The pressure relief valve SPV/SPVF is a direct spring sliding piston valve. It is intended for mounting in pipelines and is suitable to safeguard low pressure hydraulic circuits. The pipe connection is to be effected either by SAE-mounting surfaces ( psi) or by Whitworth pipe threads G. Notes - When using strongly aerated media, the valve should preferably be mounted vertical with the setscrew facing down. - The tank connection T of the valve must not be exposed to underpressure when subject to flow (Q > ), as in this case the valve cannot be ventilated, possibly resulting in unwanted vibrations and noise. If this is unavoidable, the special solution (S33) provides an alternative. Valve Construction The siiding piston 2 is pressed against the annuiated area a by the compression spring 3. Thus the pressure connection P is separated from the tank connection T by sealing the diameter d. As soon as the opening pressure p is achieved, adjusted by the set screw 4, the siiding piston 2 releases the fluid flow to the tank connection. The spring chamber b is pressure compensated by the bore c. When starting-up the valve the spring chamber b must be bleeded by the bleeding screw, (hex. socket width: 4). The pressure relief valves are available in different pressure setting ranges because, due to their spring rates, each of the compression springs can only cover a limited pressure setting range. 2 RACHT GmbH Gewerbestr Werdohl, Germany Phone Fax info@kracht.eu Web

3 ATEX Explosion protection Field of application for the pressure relief valves. The valve is used to secure low pressure hydraulic circuits with various flammable and non-flammable fluids. They can be used: a In Zone 2 (Gas-Ex, Category 3 G) in the explosion groups IIA, IIB and IIC b In Zone 22 (Dust-Ex, Category 3D), in the explosion groups III A and III B at non-conductive dusts with a minimum ignition energy >1mJ c In Zone 1 (Gas-Ex, Category 2 G) in explosion groups IIA, IIB and IIC d In Zone 21 (Dust-Ex, Category 2D) in the explosion groups III A and III B at non-conductive dusts with a minimum ignition energy >1mJ The qualification for the surface temperature is T4; for all gases, vapours, mists with an ignition temperature >13 C, the operating materials are not an ignition source. In the Dust-Ex area, 13 C is the reference temperature for further considerations regarding the safety margin to the glow temperature, etc. (can only be decided by the operating company). The permissible ambient temperature ranges from -- C Ta 6 C - NBR, CR -- 1 C Ta 6 C - FM, HNBR - Flashpoint, minimum ignition temperature and mediaspecific attributes must be complied with by the operating organisation. - No not allow any explosive mixture to be present inside the unit. Marking according to the Machine Directive 14/34/EU Manufacturer RACHT GmbH D-8791 Werdohl Type designation SPV... Consignment no., Year of manufacture xxxxxx/xx-xxx xx.xx Tech. File Ref. TRR: 4.2X Protection type marking II 2 GD EEx ciic (T4) or II 2 GD EEx c (T4) RACHT GmbH Gewerbestr Werdohl, Germany Phone Fax info@kracht.eu Web 3

4 Characteristics Product name / Nominal size SPVF = NG SPVF = NG... 8 Construction Mounting Slide valve / directly-operated (Poppet valve on request) Pipe connection / panel mounting Pipe connection Flange connection ISO (SAE J18) Pipe thread ISO Dimensions Pages 8,, 11, 12 Weight Pages 8,, 11, 12 Fitting position any, pressure setting screw below preferred (see page 2) Housing material EN-GJL- (EN-GJS--1) Type setting Mechanical Set screw nob Accessories Δp-Q-Characteristics Page and 6 Welding flange SAE ( psi) Page 12 Hydraulic fluids Hydraulic oils acc. to DIN 1 24/ (other fluids on request) Hydraulic Characteristics Nominal size / 32/ 8 Max. flow rate Q l/min 9 8 Max. working pressure bar min. working pressure at tank connection bar no underpressure permissible (at Q > ) * Setting range response pressure p v min bar..... p v max bar Media temperature NBR ϑ m = -- C... 9 C (Design A + E) FM ϑ m = -- 1 C... C (Design C + ) Copper ϑ m = -- C... 2 C (Design B + F) Soft iron ϑ m = -- C... 3 C (Design D) Ambient temperature ϑ u = -- C... 6 C (NBR, copper, soft iron) ϑ u = -- 1 C... 6 C (FM) * see page 2 - Notes Viscosity range ν min mm 2 /s 1.2 ν max mm 2 /s (standard) higher viscosities on request Note: Metallic protective cap (cap nut) in ATEX version 4 RACHT GmbH Gewerbestr Werdohl, Germany Phone Fax info@kracht.eu Web

5 Characteristic Curves p E Q Viscosity = 34 mm 2 /s = possible setting range of the pressure stage SPV Set Einstelldruck pressure pe [bar] Set Einstelldruck pressure pe [bar] SPVF / Set Einstelldruck pressure pe [bar] 1 3 Flow Durchfluss rate Q [l/min] Flow Durchfluss rate Q Q [l/min] [l/min] Set Einstelldruck pressure pe [bar] 1 3 Flow Durchfluss rate Q [l/min] Flow Durchfluss rate Q Q [l/min] [l/min] Einstelldruck Set pressure pe [bar] Flow Durchfluss rate Q Q [l/min] [l/min] RACHT GmbH Gewerbestr Werdohl, Germany Phone Fax info@kracht.eu Web

6 Characteristic Curves p E Q Viscosity = 34 mm 2 /s SPVF 32/ SPVF SPVF 8 Einstelldruck Set pressure pe [bar] Einstelldruck Set pressure pe [bar] Einstelldruck Set pressure pe [bar] Set Einstelldruck pressure pe pe [bar] Flow Durchfluss rate Q Q [l/min] Flow Durchfluss rate Q Q [l/min] Flow Durchfluss rate Q Q [l/min] Flow Durchfluss rate Q Q [l/min] [l/min] 12 2 Set Einstelldruck pressure pe pe [bar] Set Einstelldruck pressure pe [bar] Set Einstelldruck pressure pe [bar] Flow Durchfluss rate Q Q [l/min] [l/min] Flow Durchfluss rate Q Q [l/min] Flow Durchfluss rate Q Q [l/min] 2 6 RACHT GmbH Gewerbestr Werdohl, Germany Phone Fax info@kracht.eu Web

7 Type ey Ordering example NG SPV (M) A 1G 1 A 12 ATEX ATEX design Pressure stage bar bar... bar Type of setting A Set screw B nob Construction code (Specfied by RACHT) Nominal size Q max l/min Pipe connection 1G Threaded connection G 1/2" Versions A Standard version NBR B High temperature version C22/Cu C FM version D Soft iron seal E GJS housing NBR F GJS High temperature version C22/Cu GJS housing with FM seal L GJS housing with FM seal, ball seat valve Mounting without specification M standard panel mounting Product name Ordering example: SPV B1G 1 A 12 Pressure relief valve, directly spring operated, nominal size (Q max l/min), high temperature version (up to +2 C) with threaded connection G 1 2, pressure setting by set screw, pressure setting range 4 up to 12 bars Ordering example: SPVM A1G 1 B Pressure relief valve, directly spring operated for panel mounting, nominal size (Q max l/min), standard version with threaded connection G 1 2, pressure setting by knob, pressure setting range up to bars RACHT GmbH Gewerbestr Werdohl, Germany Phone Fax info@kracht.eu Web 7

8 Dimensions (in mm) Ordering codes A CE B SPV 1G 1A. SPV D 1G 1A. F L SPV C E L A 1G1 A. - ATEX A CE SPV 1G 1B. L A CE SPVM A 1G1 B. L A CE SPVM A 1G1 A. L panel thickness panel thickness adjustable stroke 8 RACHT GmbH Gewerbestr Werdohl, Germany Phone Fax info@kracht.eu Web

9 Type ey Ordering example NG... 8 SPVF (M) A 2F 1 A 12 ATEX Product name Mounting M Panel mounting (only NG, ) (on request) ATEX design Pressure stage bar 2... bar bar (only NG ) bar... bar bar (only NG )... bar (only NG /) Type of setting A Set screw B nob (on request) Construction code (Specfied by RACHT) Pipe connection 2F SAE flange psi 1G Threaded connection G Versions A Standard version NBR B High temperature version up to +2 C C FM version up to + C D Soft iron seal E GJS housing NBR F GJS high temperature version up to +2 C G NBR version, lead seal possible GJS housing with FM seal Nominal size Q max 9 l/min Q max 9 l/min 32 Q max l/min Q max l/min Q max l/min 8 Q max 8 l/min Ordering example: SPVF 8 A1G 1 A 12 Pressure relief valve, directly spring operated, flange version, nominal size 8 (Q max 8 l/min), standard version with threaded connection G3, pressure setting by set screw, pressure setting range 4 up to 12 bars Ordering example: SPVF B2F 1 A Pressure relief valve, directly spring operated, flange version, nominal size (Q max l/min), high temperature version up to +2 C) with SAE mounting surfaces ( psi), pressure setting by set screw, pressure setting range up to bars RACHT GmbH Gewerbestr Werdohl, Germany Phone Fax info@kracht.eu Web 9

10 Dimensions (in mm) Ordering codes A SPVF. CE 2F 1A. A SPVF. CE 1G 1A. B B SPVF. D 2F 1A. SPVF. DF 1G 1A. F RACHT GmbH Gewerbestr Werdohl, Germany Phone Fax info@kracht.eu Web

11 Dimensions (in mm) Ordering codes A A CE CE SPVF. 2F 1A. ATEX SPVF. 1G 1A. ATEX Nom. SAE Thread Weight size flange R A B C D E F G H L 1 L 2 L 3 M SW1 SW2 SW3 SW4 kg 3 4 G M G M G M G M G M G M RACHT GmbH Gewerbestr Werdohl, Germany Phone Fax info@kracht.eu Web 11

12 Accessoires Welding Flange SAE ( psi) Screw O-ring SAE flange Screws O-ring max. Weight.9 working pressure A B C D E F G H bar kg 3 4" M x x " M x x " M x x " M12 x x " M12 x x " M16 x 8.32 x (Dimensions in mm) 12 RACHT GmbH Gewerbestr Werdohl, Germany Phone Fax info@kracht.eu Web

13 Product Portfolio Gear Pumps Gear pumps for lubricating oil supply equipment, low pressure filling and feed systems, dosing and mixing systems. Hydraulics Single and multistage high pressure gear pumps and hydraulic motors for construction machinery, vehicle-mounted machines. Flow Measurement Gear, turbine and screw type flow meters and electronics for volume and flow metering techno logy in hydraulics, processing and laquering technology. Valves Cetop directional control and proportional valves, pressure, quantity and stop valves for pipe and slab construction. SPV, SPVF direct operated /GB/3.18 RACHT GmbH Gewerbestraße 8791 Werdohl, Germany Phone Fax info@kracht.eu Web