The bellows valve of Primet has an excellente air-tight structure to protect the portions making contact with the fluid (media) from the atmosphere in order to make the screw-type stem corrosion-inhibitting.
The compact type of PSBV series has the main body made of SUS316L; and the orifice diameter ranges from 4.5mm to 12mm. On the other hand, the large-sized PLBV series has the forged body and the size varies from 8mm to 20mm tobe suitable for large quantities of flow.

Materials of Construction

No.	Part name	Qty	Materials
1	Handle Cover	1	Nylon
2	Stem Nut	1	St. St. 304
3	Locking Washer	1	St. St. 304
4	Handle	1	Nylon(Aluminium PLBV series)
5	Position Indicator	1	Nylon
6	Stem Locking Ring	1	St. St. 304
7	O-ring	1	Viton® (fluorocarbon KFM)
8	Actuator	1	St. St. 316L
9	Bonnet	1	St. St. 304
10	Bonnet Gasket	1	PCTFE(PTFE, PCTFE PLBV series)
11	Bellows	1	St. St. 316L
12	Stem	1	St. St. 316L
13	Disk	1	PCTFE / (PTFE PLBV series)
14	Body	1	St. St. 316L

Specifications & Tests

	PSBV Series	PLBV Series
Pressure Test	1.5 X Max work pressure	1.5 X Max work pressure
Helium Leak Test	＜7 X 10-10Pa.㎥/sec (7 X 10-9Atm cc/sec)	＜1 X 10-6Pa.㎥/sec (1 X 10-5Atm cc/sec)