Technician A says a tractor valve may have a crack pressure as high as 10 psi. Technician B says trailers typically use crack valves between 6 and 8 psi. Who is correct?

Select one:
a. Technician A only
b. Technician B only
c. Both Technician A and Technician B
d. Neither Technician A nor Technician B

Both Technician A and B are correct regarding crack pressures, as tractors may have valves up to 10 psi and trailers typically use 6 to 8 psi. This shows the variability in hydraulic systems across different applications.

Explanation:

Understanding Valve Crack Pressures

In the context of hydraulic systems, such as those used in tractors and trailers, the term "crack pressure" refers to the minimum pressure needed to open the valve and allow fluid to pass through. According to Technician A, a tractor valve may have a crack pressure as high as 10 psi, which is within the realm of possibility for some hydraulic systems, especially those designed for heavy-duty applications. On the other hand, Technician B mentions that trailers commonly use crack valves that operate between 6 and 8 psi, which aligns with industry standards for lighter hydraulic systems.

In summary:

Technician A is correct in stating that tractor valves can have a crack pressure of up to 10 psi.
Technician B is also correct in the context that many trailers typically operate within the range of 6 to 8 psi.

Thus, both technicians are correct as their statements cater to different hydraulic system applications.

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