Description

Spirax Sarco srv66 is an angle pattern self-draining sanitary pressure regulating valve of all 316 type stainless steel construction suitable for use on steam, water and inert industrial gases. It is available with sanitary clamp compatible connections, requires no external pressure sensing line and has clean in place (CIP) and sterilise in place (SIP) capability.

Typical applications include: Clean steam, gas and liquid supplies to bioreactors, centrifuges, freeze dryers, sterilisers, autoclaves, process tanks, humidifiers and culinary equipment.

Valve tightness

Valve tightness is in accordance with VDI / VDE guideline 2174 (leakage rate < 0.5% of Kvs value).

Technical Information

Pressure/temperature limits

Body design conditions Inlet	PN10
Outlet	see 'Pressure setting range' below
Maximum design pressure	9.5 bar @ 50 C (138 psi g @ 122 °F)
Maximum design temperature	300 °C @ 5.8 bar (572 °F @ 84 psi g)
Minimum design temperature	-10°C(14°F)
Maximum operating temperature	180°C(356°F)
Maximum operating pressure (inlet)	8 bar g (116 psi g)
Minimum operating temperature	-10°C(14°F)
Designed for a maximum cold hydraulic test pressure of	15.2 bar g (220 psi g)

Pressure setting range

Size	DN15 - DN50 ( - 2")
Inlet/outlet rating	PN10/PN2.5	PN10/PN6	PN10/PN10
Spring range	0.3- 1.1 bar g (4.4 - 16.0 psi g)	0.8-2.5 bar g (11.6 - 36.3 psi g)	1.0 -5.0 bar g (14.5 - 72.5 psi g)

Maximum permitted outlet pressure = 1.5 times set pressure

Materials

No.	Part	Material
1	Body (integral seat)	Stainless steel	1.4404 (316L)
2	Main valve	Stainless steel	1.4404 (316L)
3	Spring housing	Stainless steel	1.4404 (316L)
4	Adjustment screw	Stainless steel	BS 6105 A4 70
5	Spring	Stainless steel	1.4301 (304)
6	Spring clip (not listed)	Stainless steel	1.4301 (304)
7	Diaphragm nut	Stainless steel	BS 6105 A4 70
8	Diaphragm plate	Stainless steel	1.4404 (316L)
9	'V' band clamp	Stainless steel	1.4404 (316L)
10	Diaphragm	FPM (Viton)/ PTFE
11	O'ring	PTFE
12	'V' band clamp screw	Stainless steel	BS 6105 A4 70

Dimensions and Weights

Setting bar range	Size	Nominal diameter DN
		15	20	25	32	40	50
0.8 - 2.5 / 1-5	AE1	90	90	90	120	120	120
	AE2	90/100/110	90/100/110	90	120	120	120
	C	200	200	200	200	200	200
	D	138	138	138	138	138	138
0.3 - 1.1	AE1	120	120	120	120	120	120
	AE2	120/140	120/140	120	120	120	120
	C	200	200	200	200	200	200
	D	200	200	200	200	200	200

Kv Values

To maximise the control accuracy (especially for large load variations) use the Kv values given at 20% offset. For safety valve sizing use the maximum Kv values.

Valve size	DN15	DN20	DN25	DN32	DN40	DN50
Kv at 20% offset	2.0	3.0	3.5	4.0	4.5	5.2
Maximum Kv	2.6	3.9	4.6	5.2	5.9	6.8

For conversions: CV (UK) = KV x 0.963, CV (US) = KV x 1.156

Installation

Before installing the valve thoroughly flush the pipeline. Ideally the valve should be installed in a pressure reducing valve station, at the very minimum there should be a separator and strainer fitted upstream, these should be serviced at regular intervals. The SRV66 should always be fitted with the inlet horizontal and the spring housing directly above the valve. Most applications will require a safety valve to be installed downstream in case of accidental overpressure. It should be noted that the valve should not be used as a shut-off valve, a separate valve should therefore be used for isolation purposes if required.

The pressure reducing valve should not be insulated as this may lead to over heating and destroy the elastomer seals.

Maintenance and Spares

Maintenance

• Clean all pipeline filters or strainers.
• Inspect diaphragm and valve assembly.
• Release compression on the control spring before attempting any maintenance.

Available Spares

Diaphragm and 'O' ring gasket kit.