ARC with valve body combination 20 ARC diaphragm stem seal.

Application

ARC is an aseptic seat valve with PTFE diaphragm. It is available as a stop- or change-over valve.
The valve is suited for aseptic operating conditions such as high sterilisation temperatures. ARC is characterised by excellent cleanability.

Working principle

ARC is operated by means of compressed air and can be supplied with or without spring return.
Sterile stem sealing towards the atmosphere is ensured by a special designed PTFE/rubber diaphragm unit. The PTFE diaphragm does not allow product residues to build up on the product contact surface.

Standard Design

ARC is based on the SRC valve design. It consists of actuator, bonnet, stem with diaphragm unit and valve bodies. The change-over version is a two body design.
The valve is assembled by means of clamp rings and a stem clip system for easy maintenance.

Valve body combinations

20	30	21	22	31	32

Actuator function

• - Pneumatic downward movement, spring return (NO).
• - Pneumatic upward movement, spring return (NC).
• - Pneumatic upward and downward movement (A/A).

Other valves in the same basic design

Sanitary Remote-Controlled valve, type SRC.
Sanitary Long-Stroke valve, type SRC-LS.
Sanitary Manual valve, type SMO.
Aseptic Remote-Controlled Valve with steel bellows, type
ARC-SB.
See also PD 60019, PD 65142, PD 60789 and PD65432.
 

Pressure drop/capacity diagrams

Stop valve		Change-over valve

Pressure data for ARC

Actuator type / function

10. Pneumatic downward movement, spring return (NO-lower seat).
20. Pneumatic upward movement, spring return (NC-lower seat).
30. Pneumatic upward and downward movement (A/A).
60. Three-position (NO-lower seat)
70. Three-position (NC-lower seat).

Table 1: Standard Valves - Max. static pressure in bar without leakage, valve seat fully closed.
Actuator / Valve body combination and direction of pressure	Air pressure (bar)	Actuator type/ function	Type	Valve size					Air consumption
				DN40	DN50	DN65	DN80	DN100	(Litres free air per stroke)
				38	51	63.5	76.1	101.6	38-63.5	76-101.6
				mm	mm	mm	mm	mm	mm	mm
		10(NO) 60(NO)		8.0	8.0	8.0	8.0	8.0	0.2 x Air pressure (bar)	0.7 x Air pressure (bar)
	5	10(NO) 60(NO)	ISO	7.0	4.0	3.0	4.0	2.5
	5		DIN	6.0	3.6	3.0	3.2	2.5
	6		ISO	8.0	5.5	4.0	6.0	4.0
	6		DIN	8.5	5.0	4.0	4.8	4.0
	5	20(NC) 70(NC)		8.0	8.0	8.0	8.0	6.0
	6			8.0	8.0	8.0	8.0	8.0
		20(NC)
		70(NC)	ISO	7.0	4.0	2.5	5.0	3.5
			DIN	7.0	3.4	2.3	5.0	3.5

AC = Air closes
SC = Spring closes

Table 2: Valves with reinforced spring or larger actuator - max. static pressure in bar without leakage, valve seat fully closed.
Actuator/valve body combination and direction of liquid pressure	Air pressure (bar)	Actuator type/ function	Type	Reinforced spring					Larger actuator
				Valve size					Valve size
				DN40	DN50	DN65	DN80	DN100
				38	51	65	76	101.6	38	51	63.5
				mm	mm	mm	mm	mm	mm	mm	mm
		10(NO)		8.0	8.0	8.0	8.0	8.0	8.0	8.0	6.0
		60(NO)
	5	10(NO) 60(NO)	ISO	2.0	0.0	0.0	0.0	0.0	8.0	8.0	6.0
	5		DIN	1.7	0.0	0.0	0.0	0.0	8.0	7.7	6.0
	6		DIN	1.7	1.8	1.0	0.8	1.0
	6		ISO	2.0	2.0	1.0	1.0	1.0
	5	20(NC) 70(NC)		2.0	2.0	2.0	0.0	0.0	8.0	8.0	8.0
	6			8.0	8.0	8.0	8.0	8.0
		20(NC) 70(NC)	ISO	8.0	5.5	3.5	7.0	4.5	8.0	8.0	6.0
			DIN	7.7	4.6	3.5	5.6	4.5	8.0	8.0	5.9

* = Max. pressure in bar for ARC standard valves.
** = Max. pressure in bar for ARC with reinforced spring.
*** = Max. pressure in bar for ARC with larger actuator.

Table 3: The valve is in the closing phase. Approx. max. product pressure in the valve body at which the valve plug can close by means of the spring or air pressure.
Actuator/valve body combination and direction of pressure	Actuator type/function	Valve size
		DN40	DN50	DN65	DN80	DN100
		38	51	65	76	101.6
		mm	mm	mm	mm	mm
	20(NC)	3.1*	4*	4.8*	8*	8*
		4.8**	6.7**	6.9**	8**	8**
	70(NC)	7.4***	8***	8***
	10(NO)	4.6*	5.4*	6.5*	8*	8*
		2**	2.5**	2.9**	8**	8**
	60(NO)	8***	8***	8***

AO = Air opens
SC = Spring opens

Table 4: Standard valves - Approx. static pressure in bar against which the valve plug can open by means of the spring or air pressure.
Actuator/valve body combination and direction of pressure	Actuator type/function	Valve size
		DN40	DN50	DN65	DN80	DN100
		38	51	65	76	101.6
		mm	mm	mm	mm	mm
		8*	8*	8*	8*	8*
	10(NO)	8**	8**	8**	8**	8**
	60(NO)	8***	8***	8***
		8*	5.5*	4.5*	8*	8*
	10(NO)	7.5	7.5	5.5	8**	8**
	60(NO)	8***	8***	8***
		8*	8*	8*	8*	8*
	20(NO)	8	8	8	8	8
	70(NO)	8***	8***	8***
		8*	8*	8*	8*	8*
	10(NO)	6	6	6	8*	6*
	60(NO)	8	8	8

AC = Air closes
SC = Spring closes

Table 5: The valve is closed - at these liquid pressures the valve will open.
Actuator/valve body combination and direction of pressure	Actuator type/function	Valve size
		DN40	DN50	DN65	DN80	DN100
		38	51	65	76	101.6
		mm	mm	mm	mm	mm
	20(NC)	5.9*	8*	8*	8*	8*
		8**	8**	8**	8**	8**
Spring closes	70(NC)	8***	8***	8***
	10(NO)	8*	8*	8*	8*	8*
		3.5**	8**	8**	8**	8**
Air closes (6 bar)	60(NO)	8***	8***	8***

Fig. 3. Dimensions.

a. Stop valve.	b. Change-over valve.

Materials

Technical data

Note! Vacuum is not recommended in aseptic applications.
Expected lifetime of diaphragm unit under normal conditions: (no pressure shocks or cavitation).

Options

• - Male parts or clamp liners in accordance with required standard.
• - Control & Indication (see chapter in Product Catalogue).
• - Damper against water hammer.
• - Actuator with stronger spring.
• - Larger actuator for valve size 38 - 63.5 mm, DN 40-65.
• - Two-step or three-position actuator.
• - Tangential side port valve.
• - Product wetted seals of Nitrile (NBR) or Fluorinated rubber (FPM).
• - Service tool for actuator.

Ordering

Please state the following when ordering:

• - Connections if not welding ends.
• - Size.
• - Valve body combination.
• - Actuator function NC, NO or A/A.
• - Options.