One-Piece Ball Valves Two-Piece Threaded

2-piece Monoblock Ball Valve

On this page you will find all the documentation related to Z004 threaded two-piece one-piece ball valves, and you can download the data sheet below with: descriptions and dimensions, ISO 5211 connection and example of use, valve breakaway torques, and the pressure and temperature diagram. 

All ball valves are certified to PED 2014/68/EU and ATEX 2014/34/EU.

One-piece Ball Valves: General Uses

Shut-off valve (ON-OFF) for industrial high-pressure and temperature systems, oil & gas sector, hydraulic and pneumatic systems, chemical, pharmaceutical, food & beverage and steam systems up to +195°C with standard seals.

One-piece Ball Valves: Construction according to standards

UNI-EN 12516-2
ASME B1.1-2019
UNI-EN 16722 M3
ISO 14313: 2007
ASME B16.34

One-piece Ball Valves: Construction Diameters

DN8 (Ø1/4") to DN 100 (Ø4")

Materials used:

Carbon steels / INOX steels
Special steels (on request).

Pressure rating (operation)

PN 40 to 210 / Class 800 to 3000

Design features (Standard):

Body / ferrule filtered union with double seal
Connections Sec. ISO7 RP (GAS) / ASME B.1.20.1 (NPT)
'V' pack on stem
Anti-ejection stem
EN stamping / CE marking
Anti-static device sec. BS 5146/74
ISO 5211 stuffing box
100% valve testing with air at 7 bar (immersion)

Design features
(Optional / Accessories on request):

Reinforced PTFE Seals (GLASS / CARBON

Seals in other special material:

PEEK / PE / GRAPHITE / POM-C (Delrin ®)
Stem extension
Cryogenic extension (for critical service)
Handle / Oval handwheel
Pneumatic actuator SE / DE
Solenoid valve
Electric motor
finest holder box
Manual reducer
(pneumatic / electro-pneumatic)
Heating channel on valve body

One-piece Ball Valves: Operating temperature range

- 10°C to + 180°C for construction materials
made of carbon steel, seats and seals made of P.T.F.E.
- 20°C to + 180°C for construction materials
made of stainless steel, seats and seals made of P.T.F.E.
- 20°C to + 70°C for construction materials
made of steel and seats made of DELRIN.

One-piece Ball Valves: Standards for connections/connections

Gas ISO7- Rp / ASME B1.20.1 (NPT) / ASME B16.25
(B.W.) / ASME B16.11 (S.W.).

Materials of construction body and valve latches:

ASTM A 105 - ASTM A 350 LF2 (corr. EU S355J2)
Low carbon steels alloyed by bonification.
AISI 304 / AISI 304L - AISI 316 / AISI 316L
Austenitic-type stainless steels.
DUPLEX F51 / Super DUPLEX F55 / Hastelloy
C276 / MONEL - Special steels of the
austenitic-Ferritic type.
AISI 420 - Stainless steels of the Martensitic type.

Materials of construction seals and valve seats:

R.T.F.E. - TEFLON ® reinforced/glass filled,
grafite, metal (in %).

One-piece Ball Valves: Accessories and Options

One-piece ball valves can be painted according to customer specifications.

A350 LF2 steel valve body, 316L stainless steel stem.

304L stainless steel valve ball.

Ball with balance hole.

Other materials are available upon request.

Complete customization of valves possible.

Limit switch box in aluminum - stainless steel - technopolymers.

Pneumatic rotary actuators

Electric rotary actuators

Manual gearboxes

Levers and solenoid valves

Methods and Precautions for Use

Z004 CE-marked ball valves meet the requirements of PED Directive 2014/68/EU and/or ATEX Directive 2014/34/EU.

1) All standard Z004 valves can be used in a temperature range of -10°C to +150°C. For different temperatures, the valve must be equipped with seals made of material suitable for the required operating temperature.

2) All standard Z004 valves are not equipped with devices against internal overpressure, such devices as balance hole or etched seat are available upon specific request from the end user.

3) All standard Z004 valves in general, do not accept the presence of ice and fluids subject to instability inside the valve, as they would block the OPEN or CLOSE maneuvers, also the increase in fluid volume can damage the valve components making it no longer usable.

4) Standard Z004 valves can be used at low temperatures (from -29°C and down to -196°C for cryogenic service) or at high temperatures (up to +250°C). Any requests should be agreed upon by the customer with the sales department at the time of order/offer.

5) Z004 valves can be used for "industrial" oxygen use only if thoroughly degreased and packed in special bags. Any medical use should be specified at the time of order/offer.


Before installation, check the suitability of the valve for the intended use.

In case the valve is used in a potentially explosive atmosphere, it is necessary to assess its suitability according to the hazard zone in which it is installed (see ATEX Directive 2014/34/EU).

Check before installation that the piping is properly cleaned and free of dirt or welding residue. In the case of valves with weld ends, it is the installer's responsibility to ensure that the work is done properly.

The commissioning of a valve should always be done by trained personnel is authorized. Take care to properly align piping with the valve to avoid pulling effect.


Depending on the operating conditions, operating period of the valve and the number of operations, the valve may experience leakage problems due to settling and wear of the seals or slight leakage of the stuffing box.

Zema recommends replacing the various seals every 2 years of operation. In addition, it should be remembered that whenever the valve is disassembled, the seals between the body/ring/side body should be replaced.

All maintenance work must be performed by qualified personnel.

In the case of disassembly of valves through which fluids, hazardous or harmful gases pass, additional precautions should be taken (see system action specifications).


External fluid leakage
The operating conditions of the valve, warranted by the manufacturer, have not been met.
The valve has suffered corrosion due to chemical incompatibility between the valve materials and the fluid. Wear of the packing gaskets due to failure to perform periodic maintenance.
Loosening or stretching of the valve body joining screws has occurred.

Internal fluid leakage
Damage to seals or ball surface due to the passage of foreign matter.
Internal seals are worn: valve maintenance should be performed.

The valve has too high an operating torque, or the valve is stuck
Any change in the state of the product used inside the valve (Ex. from water to ice).
Any deposit of particles on the outer surface of the ball.

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