Float Valves SVP(Pilot controlled On-Off Valves)

ERHARD Float Valves SVP:Quality and Reliability

ERHARD Performance Your AdvantageFlow operated. Operating safety, no energy supply needed.

Large range of setting water levels: Field approved.50 - 4000 mm.

High quality materials: body of SG Robust and reliable.ductile cast iron High strength, long life.Internal and external EKB epoxy coating. Efficient surface protection.

Seat not subject to cavitation. No wear and tear.

Exclusive On-Off valve No risk of damages due to cavitation.

All internal parts accessible from above. Easy maintenance.Maintenance of pilot system withoutbreaking supply.

Position identified at a glance. Easy operation.Pressure gauge with isolating valve.

Float control easily mounted. Easy installation.

Adjustable closing velocity. Water hammer control.

Performance

Recommended Installations

The pilot controlled ERHARDFloat Valve is composed of mainvalve and pilot system. The mainvalve consists of: body, cover,plug with guide, diaphragm, andposition indicator.

Upstream pressure acts on chamber A.Downstream pressure acts onchamber B.Control pressure acts onchamber C.

The pilot system includes:Upstream pipe branch I, pilotpressure line II, 3/2-way pilotvalve III, counterweight IV, float V, two adjustable stops VIand VII, weight VIII, float cable IX, throttle valve andmanually operated valve.

These Float Valves maintainadjustable minimum and maximum water levels in a reservoir.

When the water level in thereservoir rises, the float guidedby the control cable slides up-wards to the upper stop. Thebuoyancy of the float lifts thecable with the weight and thecounterweight switches the 3/2-way valve. The upstream main isnow connected with the pilotpressure line. The upstream pres-sure in chamber C closes themain valve tightly.

With a decrease of water level inthe reservoir, the float guided bythe float cable slides down-wards. The main valve remainsclosed until the float reaches thelower stop (minimum level). Theadditional float weight causesthe counterweight to rise and toswitch the 3/2-way valve. Now,chamber C is connected to theambient pressure via the pilotpressure line. This pressure relief

causes the main valve to opencompletely.

The main valve operates withinthe range of the stops as On-OffValve. Intermediate positions arenot possible. The difference bet-ween the top and bottom waterlevels is adjustable from 50 mmto 4000 mm with an accuracy of 20 mm.

SizingThe valve is not sized to thepipeline diameter but in accor-dance with maximum flow con-ditions and installation situation.

For an optimum sizing of thevalve, we recommend a flowvelocity of v = 2 - 2,5 m/s (see flow table).

Recommended flow rate in l/s (m3/h)

Feeding from above

At the outlet of the valve werecommended to install a 90 elbow

the outlet of which ends abovethe water surface.

Feeding from belowFloat control inside

the reservoir

Feeding from belowFloat control outside

the reservoir

I Air Valve

II Isolating Valve

III Strainer: max.mesh size 2 mm

IV ERHARD-FloatValve

V 3/2-way Pilot Valve

Feeding the reser-voir can be doneeither from aboveor from below.When feeding isdone from below,the upstream pres-sure (Pu) has to beas follows:Pu > H + 0.5 bar.For feeding fromabove:Pu > 0.5 bar.

DN

V = 2,5 m/s

50

5 (18)

65

8,5 (30)

80

12,5 (45)

100

19,5 (70)

125

31 (111)

150

44 (158)

200

78,5 (283)

In exceptional cases, flow velocities of 4 m/s are admissible. Additional functions as flow limitation and sustaining the upstream pressure are possible. Please contact us.

I II III

V

IV

ERHARD Float Valve SVP PN 10/16 6020 54006021 5400

Material and Equipment

Dimensions

pilot controlled On-Off valve

Range of application: water max. 70 C

When placing the order, please specify max. flow rate, max. static pressure when the valve isclosed, minimum pressure upstream of the valve at max. flow rate, the minimum and maximum pressure downstream of the valve.

Flanges type B..., connecting dimensions to ISO 7005-2 Type 21, PN 16 or PN 10.

SizeDN

20050 - 200

250 - 600

Pressure ratingPN

1016

upon request

Prod. no.

6020 54006021 5400

Surface protection EKB epoxy coating, blue

Body and cover SG ductile cast iron to EN-JS 1040

Plug/clamping ring Injected cast iron / bronze

Body seat and guide Bronze

Sealing ring EPDM

Diaphragm Neoprene with fabric ply

Guide rod and screws Stainless steel

Position indicator Stainless steel / brass

Pilot circuit, fittings, and ball valve Stainless steel / brass, nickel-plated

3/2-way pilot valve, manual valve3) Brass

Throttle valve4), filter Brass / Stainless steel

Float dia. 150, float cable, Plastic / Stainless steelbrackets

Brackets for stilling Stainless steeltube dia. 200

Pressure gauge with isolating valve Upstream

Size

DN

506580

100

125150200

Face-to facedimension

Lmm

230290310350

400480600

Flangedia.D

mm

165185200220

250285340

h1mm

225245265290

385430730

Height Space requirement

h2mm

8595

105115

130145175

e1mm

220205210170

220235215

e2mm

135150155220

170185215

Weight

ca.kg

17232836

4973

116

Packingdimensions

l x b x hcm

70 x 40 x 4070 x 40 x 4070 x 40 x 4070 x 40 x 40

80 x 50 x 4080 x 50 x 4090 x 50 x 70

3) This manual valve facilitates opening and closing the float valve independent of the pilot unit.4) By means of the throttle valve, the opening time of the main valve can be controlled within a

certain range.ERHARD Float Valve with upstream pressure sustaining device. ERHARD Float Valve with flowlimiting device. Prices upon request.

250-600 on request

Stilling tube (PVC rigid dia. 200) and the copper tubes (dia. 8 x 1) for pilot circuit are notincluded in our supply.

Data corresponding to the latest level of development, modifications reserved.

Printed in Germany. 08/02

Postfach 1280 D-89502 HeidenheimPhone: +49(0)7321 320-0 Fax: +49(0)7321 320-525http://www.erhard.dee-mail: export@erhard.de